I get the tightness in my chest if I’m having a costochondritis flare (linked to my fibro) or if my back muscles are tense and sore. Usually both happen together and I feel like I have a hard time breathing. If I pop my back and massage the sore areas of my chest and back it helps relieve the tension and I can breathe again with out tightness or pressure.

Hi Littlejo, I GET tightness in my chest. At first I thought I had pneumonia or something like that but when I went to the doctor he said it was fibromyalgia between the ribs and where they met the sternum bone. I get it regularly. Rubbing seems to help, especially the bottom ribs, under and around breasts and where ribs meet sternum bone.
Once, many years ago the inflammation went to my lungs and I was hospitalised but was told it was from a related disease called Sjogren's Syndrome.
And another of your questions about eyesight problems. Yes I get blurred vision as well as bright lightening type designs that flash from my left eye. Sometimes I can read fine and other times I can't. Doctors have said over the years that it may be sinusitis, or from pills, or admitted that they don't know. The worst was when I was driving I saw half of everything and had to pull over on a highway!
Hope this helped.

Yes I have even been to a lung specialist had test ran. I was told it's my fibromyalgia and I have asthma and he changed my inhaler. I am sorry your experience this I know the feeling

Zantac has helped me. If it's worse and there are many other things going on, emergency hospital.

Yes, I've had this and, since I had a heart attack in the past, the fear has always been that I'm having another one. However after going to the ER and being admitted to the hospital several times and all stress tests being normal I no longer freak out. A gastroenterologist who was on rotation in the ER when I was admitted said it could be related to the gastrointestinal system, which I tend to believe. I seem to get at least some relief when I burp, so there does seem to be a connection.