Allergic Reaction

Usually I check everything before I buy something because I am allergic to artificial sweeteners but I bought something that I knew used to be ok for me to drink. I drank 4 of them between last month and last week, Snapp Punch Cherry, and didn't realize they had switched over to artificial sweeteners until I went to buy another one. Now it is my fault for not checking in the first place but I got used to it being ok for me. I wondered why all of my joints hurt and why I was moving so slowly... it will take roughly another month until I can start moving normally again...