Hello @laurafin, Welcome to Connect. It sounds like you have more than polymyalgia rheumatica (PMR) going on. I'm not sure anyone here can say whether or not your other symptoms are related since we are patients like yourself. I did find an article that does mentions what I think are probably your non-PMR symptoms possibly related to food allergies.

"Many IBS patients give a history of food intolerance, but data from dietary ... Beliefs about food allergy can even lead to severe dietary restrictions[37,38]. ... Correlation between perceived food intolerance and depression, anxiety, and ... is associated with the occurrence especially of digestive complaints (diarrhoea, bloating ..." -- Psychological burden of food allergy: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4146781/

Did your doctor start you on a treatment for PMR or are you waiting to see a rheumatologist?