post juice fast question

i am now 7 weeks post my 30 day juice fast and now mostly a raw diet. when i do consume cooked meat like beef or chicken or fish the next day i have quite strong pains in my stomach, like intergestion but worst. i have also had a rash on two occasions after eating chicken. all meat is organic and prepared low fat no additives. i am also eating small portions and only may be once or twice a week. it feels like my body is not tollerating the protein? but at the same time i feel a need for more protein in my diet. has anyone experienced this before and any comments? thanks julie