Are these Ulcer related symptoms?

[Little Dee Dee]

Thank you for accepting my question.  I am 25 years old and I have had numerous medical complaints.  I will start with the stomach issues.  I have always had a sensitive stomach.  Not being able to drink milk (Lactose Intolerance).  having severe stomach pains.  Having severe cramps and stomach pains during cycle.  I get constipated very often.  I'm not gaining weight, but just can't seem to loose it either.  I get sharp pains in my stomach and a lot of bloating after meals.  I also belch a lot.  The belching is something that has just started.  On the other side of the medical issue, I tingle alot in my hands and in my feet.  Sometimes it gets to the point where it burns.  I get very dizzy and fall from a lack of balance quite often.  When I eat sugar or have a drink containing alcohol, the tingling starts.  The morning after eating something sweet or drinking I feel exhausted, I'm tingling and it all goes away leaving me witha migraine.  I've seen a doctor recently, who has me on prevacid for my stomach.  I was tested for diabetes and everything was normal.  About 5 years ago I was tested for Thyroid disease, that was normal.  I was rushed to the emergency room, where the doctor told me my blood pressure was too low.  All other test ex. ulcer, diabetes, etc. came back normal.  Two days ago I had a very heavy mentrual period, where the blood flow was very heavy for three days.  I couldn't go to work and was exhausted.  There are other minor symtoms, but these are the more frequent ones.  I'm thinking I might have an bleeding ulcer.  Which is causing the low blood pressure.