Joakim,
It sounds like your life revolves around performing and you don't want to be silent for very long, but, the healing may just take a lot more time than you would like, voices can take a long time to recuperate. Try to be patient. In addition to seeing your doctors and doing what they say, work hard on relaxation: relaxation of the throat, the mind, the body. Give the poor throat a really good season of rest and recuperation.   Get all the strain out of your methods, be sure to get coaching on vocal use that minimizes stress on your parts (not the coach who was there 'not hearing' problems while you were getting damaged). Hopefully when the lungs and mouth and body and mind are doing more of the work, the vocal cords can do their magic better.

ennx, same deal, 3 weeks is a blink in time, be patient. However, voices do lower with age, so it's possible you will lose notes over the years. Be patient and let your body heal, getting anxious about it will only make it worse.
No, lemons do not raise your voice, they are supposed to clean the mucusy crud out of your vocal apparatus, and if you feel a constant need to clear your throat, this will be helpful and you may sound better,and you may feel so confident you sail up a note or two. You could probably do as well with water, apples, or not eating cheese.