How can symptoms be medically diagnosed?

Hi. I'm a 18 female here. I have been diagnosed with herpes last year. Since two years ago all my feelings were suppressed and keeps accumulating till today to the extent that im numb and I know this is not me. I used to take things too seriously and get affected easily etc friendships and stuff. So technically I have been running away appears to be fine but I'm not sure whether I've overcome yet. But one thing I know is that whenever I wanna cry or find someone to talk to is just difficult. Probably cos im tired of it and maybe I've accepted the cruelty of the world but I know what I need now is a breakdown in order to release all the past suppression of feelings. Anyway it goes like this.. Soon after I found out that I had herpes as usual I appeared fine shortly and went back to studies. My life totally changed onwards but the period for me was very tough for and there was a period when I had dreams almost every morning for months. I guess it was due to stress and seriously cos if we are talking about symptoms I could have met alot and would this be called depression? For example I had the habit to count in numbers in order to give myself assurance in handling things or frequently washing my hands, afraid to touch children, washing myself up in procedures etc.. It may sound like an bipolar disorder wouldn't be surprising for me but at that point of time my mindset was like, perhaps it's based on my situation and my initial character?? Whatsmore, how can doctors really affirm that the patient has the mental disorder?? Ok.. So after my exams ended my dreams stopped and I thought everything was ok until i start working. Actually for the past two years I have been feeling lethargic frequently especially in the afternoon but so far it has stopped probably cos im used to daytime. Oh I have sleeping problems too, I can lay on the bed for several hours but just couldn't go to sleep sometimes. The more I press myself the more frustrated I'll get.. And im very particular about my sleeping postures and stuff. Recently, small things like random thoughts about how our tongue could stay in our mouth without touching our teeth, (my character likes to think about random things-curiosity) but the more I think the more i feel the tongue out of place and I have open my mouth to make it back to normal (normal as in it feels normal to me) and I have to distract myself from thinking further. About the work, I tend to get sleepy easily probably because of the mundane task but to the extend that I would hallucinate/daydream that people/friends are talking to me and i could even respond with sarcastic faces or nods in agreement. I used to have a hectic lifestyle but never felt like this before. I thought it was normal until one day when I was walking through a tunnel, it has "slopes" and I was wearing heels hence i was afraid that I would slide down. But suddenly the more I walk the more "lost" I got I was afraid of losing my balance even after the pavement was straight. And throughout the tunnel I kept myself to the side to hold the railings. That was freaky enough. Today I skipped my lunch but ate some biscuits and coffee but since morning I have been feeling out of place. Whenever I "stone" in front of the computer, I was very afraid that I would continue like this one and feel very helpless. After that i took a train and halfway i felt very lost as in maybe too much people in the train or too noisy. I couldnt take it and alighted the train but weird thing is my body is not weak but my head has some numb feeling.. I was very afraid what would happen to me next.. My friend said maybe i didnt eat much but i know the feeling's very different.. And later after i eat the moment i ate the second fries the feeling in my head instantly went off. Was i thinking too much? But somehow when i look at strangers i feel so lonely.. Like im trapped in my own world for a second.. Dunno whether is it because i wasn't feeling well..  And I haven't drank much recently but I have the feeling of getting a little confused between those dreams/hallucinations like I will wonder whether did it happened earlier in the day?

[Jessicatan]

Sorry forgotten to add on that my dreams are very real and your replies will be greatly appreciated.