Throat

Is in terrible condition. Vocal chords are in terrible condition. Went to see the specialist(3 doctors) and found the problem. Kinda depressed about it now considering my voice is my soul. They put a small camera through my nose to see my vocal chords. It was red and tight. I think it looked kinda swelled slightly from the coughing and clearing throat.
Here are advises from the specialist I saw.This is what I'm suppose to avoid,
1. chilli & spices
2. red meat
3. tomatoes
4. pastry
5. fatty food
6. alcohol
7. tobacco
8. carbonated drinks
9. caffeine

and this is what I'm suppose to do,
1. avoid coughing and clearing throat
2. elevate head of the bed with telephone book or brick
3. avoid overeating and excess weight
4. leave 3 hours between eating and bedtime/ don't go to bed with a full stomach
5. limit talking/singing
7. avoid using voice continuously for long period of time
8. Don't smoke(no problem with that). Avoid other people's smoke(that's a problem)
9. Don't make strange noises with your voice(animal voice) or forced whisper
10. Avoid prolonged periods of loud talking, screaming or shouting
11. keep voice box well hydrated
12. sing parts appropriate for singing range
13. reduce stress(that's a problem but what does that got to do with anything)
14. ensure breathing through nose
15. maintain overall good health (another problem), plenty sleep and regular exercise(lol. need help here)
16. being a performer, warm up and warm down

*sigh*

I wanna sing. I need to sing. The voice counselor said my voice sounded soprano and was surprised i was singing alto in choir.
Told my choir conductor about my problem. He said "You should be in soprano." I told him he said my voice was better in alto and he was puzzled. All he said was "Did I?" Felt like punching him when he said that. It's like 'thanks for screwing my voice by putting me there in the 1st place'. I didn't expect alto part to screw my voice that much.
Miss singing and I can't stand being silent the whole day. Feel anti-social and shy. I need my throat back.
Anyone has any experience here or any idea in helping me get back in shape?
I've tried all possible things and it's just driving me crazy having to smell smoke everyday, getting a headache and feeling absolutely drained considering I have to stop 1 of my medication to avoid another problem and not able to sing.....