All of this is normal. There are a few journals of Linx recovery that you could read up to gain some confidence.
Human body doesn't like surgery but it does recover remarkably given sufficient time. So, just wait it out.
If I recall, your esophagus is not normal strength, correct ? If it is not, I would expect quite a bit of dysphagia (getting stuck). And YES, this will last a while (3 months). Mine was weak and I still have some mild dysphagia, 4 months out.
You CAN experience heartburn immediately after the surgery.
I had heartburn after going off of medication immediately after Linx. So, I went back on them and quit them about 2.5 months later. Its 6 weeks since quitting them and I don't have any heartburn.
I dealt with the recovery by imagining that I did not even get the surgery, by setting my expectations at 0. When I finally went off the medication and everything worked, it was a nice bonus.