Hi Honeybee79 and Welcome to HW and the RA forum
I have Crohn's disease and AS and I have been taking MTX now for 4 years.
At first the MTX gave me hideous headaches, but once my body got used to it they stopped. I do have hair loss, from it and the pred. I take 5mg of folic acid a day and that is supposed to help. As for drinking, I just dont do it as I dont feel its worth the risk. I have blood tests every 6 weeks (when I remember ) to monitor my liver etc. I also drink a lot of water the day I take it so I dont get dehydrated and it seems to stop the headaches. I feel the MTX really helps my AS, hopefully it does the same for you.
Good luck and keep us posted.