Anyone ever had reading/concentration problems?

Hi, This is my first post. I was hoping to get some help with some very odd and very frustrating symptoms.

Whenever I read a book or try to use a computer or watch tv, I become rapidly hypoglycemic - I start to become faint (over a period of like 30 minutes). So basically I have to constantly eat, but the thing is, only certain types of meat (like beef) give me consistent bursts of energy -- if I eat only fruit or vegetables it gives me much less energy and I reach a point where no amount of further non-meat foods will help. I've done a ton of stuff to try to get this to stop, but I obviously haven't fully succeeded and it's bad enough that it prevents me from working.

I was wondering if anyone on this forum has these sorts of symptoms and what they did, or just general recommendations anyone would have?

Thanks a ton Tweet