Hi maggie. You and I are very similar. I'm 21, male, and I also have very high lung function. Our problems are alike as well. I too was vegan for a time. I got infections that made me very very tired... but didn't drastically lower my FEV1. I've done tons of research into my particular situation (depression, extremely low energy, etc...) and I think some of it might help you. I'm thinking that much of your problem is health related, and very little of it is just 'in your head'.
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First of all, I think you should eat meat. Or at least more dairy products and eggs. This makes it much more likely that you are getting the protein and nutrients you need. Man was a solid meat eater for millions of years. I understand that it is a moral dilemma for some, but the facts are the facts.
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Secondly, are you diabetic? Has your blood sugar ever been checked? The crashing you described sounds somewhat like high and low blood sugar. Having lots of carbohydrates in your diet will do this. I'm diabetic and I could barely leave my apartment before I started eating fewer carbohydrates.
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Thirdly, have you had your thyroid checked? What about your iron levels? Your hormones? The thyroid especially can cause horrendous fatigue. And the fact that you gain weight easily leads me to believe that you may have a problem there. There are many things doctors will not catch, regardless of how much they mean to help you. I'm not against doctors or anything, nor am I for alternative medicine, it's just that doctors are very busy people, and they tend to ignore problems that don't stare them in the face.
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Fourth... find that therapist. If you're taking prozac and it's very clearly not working, then find a professional who will listen. It is VERY difficult to find a good doctor, but you have to.
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This is just my advice. I'm no doctor, but I've been able to help myself tremendously by doing my own research.
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-Derek