Thanks Slightlybroken for your response. Sorry I forgot to mention how I am feeling in myself. I don't feel any stress other than the average person. I never feel anxious or worry too much. I don't get panic attacks. I have good friends and family members. I go out every day and visit my mother and my friends for a few hours as I have never been one to hang around the house. Tiredness and dizziness bothers me sometimes while I am out but it never makes me panic. I forgot to mention in my last message that sometimes when I lie down and get back up I develop a limp in my right leg for no apparent reason but its something to do with my knee. Thanks for welcoming me to the forums and I hope to speak with you again. This forum is brilliant and supportive. I wish you well.
From what you have wrote, I don't believe your problems are caused by stress or anxiety. Stress and anxiety can do many things to the body, but you did not mention that you are feeling this at the time. Besides, Most people that are suffering from anxiety have the opposite effect on their blood pressure (giving them high blood pressure), plus stress\anxiety is not effected by the heat, but neurological conditions and autoimmune disease are.
I would make a timeline of all your symptoms..more or less what you have done here. A timeline will include, what symptoms you have, when they occur, how long they lasted, and any other factors that you noticed that worsened your symptoms (heat, not enough sleep, over doing it, etc..). Take this to your neurosurgeon. You could either refer to this paper or give him a copy to read. Some doctors will take it, others might not. I think we have a Health Page about this subject as well. I would check out the Health Pages, if you haven't already done so, it's loaded with info about MS and MS mimics, and all the blood panels that need to be ran to eliminate those mimics.
I know this is a stressful situation, (not knowing what is wrong, and why this keeps happening), but with the right doctors, and the right test, you can find someone who can figure this all out.
I'm not sure if your GP could help you or not, but I guess you could go back to them and at least complain of these new symptoms so they will at least be on record. You actually need to see a neurologist, or have an appointment with this neurosurgeon, or see a rheumatologist.
By the way, Welcome to the Forum :)