So.....my arm is sore again.
I got the first dose of the vaccine on 1/14 and the debilitating pain in my arm lasted for 3 days and finally went away around 1/18. Then I was fine for 3-4 days. Yesterday, I noticed that there was a minor little spot of soreness in the area coming up again and paid it no attention. Well, overnight my deltoid muscle has become sore again. Sore enough that making my bed was uncomfortable this morning and I'm back on the ibuprofen.