I got the J & J vaccine last Sunday through the VA. I’m 49 and have a 100% service related disability. My left arm was sore at the injection site for about a day, and I had a pretty good headache that lasted for about 36 hours; it was gone by Tuesday morning. It’s now day six & a distant memory. I also have life threatening medicine and food allergies to: opiates, penicillin, amoxicillin, ampicillin, eggs, peanuts, tree nuts, fish, shellfish and dairy. They made me wait 30 minutes after my injection, as opposed to 15, because of my allergies. I honestly didn’t know what to expect with all my allergies, but they weren’t an issue.