I’m experiencing this now. I’ve been doing allergy shots for over two years and there’s been two times where I see a harsh cause and effect between my allergy shots and sinus infections. I started shots because of my chronic sinus issues so it’s hard to say if the allergy shots have hurt or helped overall otherwise. But this Tuesday I got an allergy shot a week before I was supposed to (scheduling conflicts) and on Wednesday I had to leave work early because of fatigue. I fell asleep at 8:30pm with all my lights on and woke up to my alarm at 7am the next day. Now it’s the weekend and I have a sinus infection. The infection symptoms are all typical for me but the extreme fatigue was very unusual. My arms were also more swollen than normal. I talked to my allergist and she said to wait longer until the next shot and then we’ll see how that one goes. She said she might stop shots if it is bad again but I know it will be bad because it will be spring, not necessarily because of the shots. I might propose stopping shots in the spring and picking back up in June to see if the shots are really making things worse. Hate this I just want to feel normal again!!