Food Digestion

HI! I have been having trouble with food digestion for years now. i have had a number of tests done but get different results everytime. When i eat i sometimes come out in a big rash on my face and develop spots. Just yesterday after dinner my stomach felt rock hard and really painful i become tired and felt very sick.It got so bad i had to make my self sick but the pain was still there. This seems to happen when eating certain foods which i can't seem to eliminate. It seems that anything i eat does me damage and food has became a problem. I have also noticed that i have developed red bloodshot eyes that don't disappear and my ears are always blocked. I can't remember the last time i felt alright!Can anybody help?Thanks,Daveg!