Hey Cam. Like others mentioned it may just be that the infection didn't clear up all the way while you were doing IVs. That has happened to me before. Definitely frustrating! You know your body better than anyone and it sounds like you're not feeling up to par. I think it's worth following the advice of your doctors even if that means going back in the hospital again so soon after you got out.
Talk to your team about a port. They sedated me for the procedure itself when I got mine so I don't remember any of the actual procedure itself. Afterwards the incision on my chest hurt but the worst of it only lasted a few days. It was sore for a few weeks and if I hit it accidentally for about a month after it would hurt some. I've had it for about 6.5 years now and it's definitely been worth it! If you search the forums for ports there are
lots of discussions about them that might be able to provide more info
We all go through these periods, it seems, where it's one thing after another after another! Can certainly be scary and make you question if you'll ever feel better. Something that helped me a lot was going to see a counselor. There was a thread started recently about this. CF is a lot to deal with and it helped me to talk about it with someone that wasn't my family or friends. Something that could be helpful to look into! Check with your clinic social worker if you're not sure where to start that search.