After a few hours of being awake i tend to get extreamly tired and a little dizzy, it can be a really odd sensation should i be worried?

Probably not: The best person to determine this is your doctor. You have numerous reasons to feel 'odd' sensations, with anxiety, depression and treatment with medications, to say nothing of your hypothyroidism. It would probably be a good idea to have your thyroid function rechecked to be sure it is in normal range, and discuss these issues with your psychiatrist. If not seeing one, it might be good idea.