Band too tight??

its been 13 months since my surgery and I have been doing very well with the band. I am down 84 pounds and am the smallest I have ever been. I had a fill a few months ago and when I got home I knew that it was too much, I had constant heartburn and could barely get water down.. I had some taken out and it seemed like it was not tight enough so 2 weeks ago I had more put in (about half of what they took out) and it seemed fine but the past few nights I have been waking up coughing uncontrollably and major heartburn. It goes away after I sit up for 20 minutes or so but comes back when I lay back down. I also have been getting dizzy when I get uo after sitting down. I have an appointment tomorrow to get some more taken out but was curious as to why it took so long for the symptoms to show up? has anyone else had this happen??