Exhausted mentally and physically

(*Please move to the appropriate forum if there is something that more closely matches up to this note.)

I am 30 and have been feeling exceptionally tired for the last year. I do not have health insurance, we are quite a ways into debt, we have 5 children and consequently I will *not* go to the doctor as I cannot afford to have a pre-existing condition as I will have to get health insurance first, but that will not be an option for at least another 6 months to a year.

I am at the point where I would rather die than go on. Not meaning I want to commit suicide, but rather just let my body expire so I don't feel this horrendous need for rest any longer. I need help desperately and do not know where to search. I'm a pretty smart fellow and started off in medicine, but realised that that was not the field for me as I did not wan to be owned by the insurance and pharmaceutical organisations. Instead I went down the computer science road.

I am currently struggling with my own business and employees so stress is high along with the debt and family burdens, so it is very possible that this is a stress evoked issue and I am going to try to take two corrective measures:

A) try to get at least 8 hours of sleep a night as at the moment is usually more like 5 to 7 hours and at irregular intervals as I get to bed at different times each night.

B) try to start giving myself 30 minutes for exercise in the mornings.

Notwithstanding all of this, I would like some extra advise. I am currently working on retooling my skill set to get back into my field of choice as running my own business has taken me down other roads that are not very enjoyable for me. I feel so tired and mentally unsharp that I cannot learn like I used to. I have been thinking of reverting to caffeine to gain some extra edge in the interim so that I can make it through the next few months, but I feel that that may be the wrong approach. I wish there were something I could do to tide my body/mind over while I try to get into better shape to see if that works.

I've been taking some apparently good multivitamins (liquid), herbs for stress relief and adrenal fatigue, mental clarity, etc. etc. but I seem to see no real results from anything. I don't physically feel unhealthy, just mentally and physically exhausted, but
I can't afford to stop. Sometimes I wish I could get ahold of those neuro enhancers that med students and lawyers are on at the moment at the advanced research universities so I could get the mental edge I need right now.

Any ideas/thoughts/experiences from folks here? I am loosing my sanity and need some kind of assistance.