About 3.5 years ago I bought a new mattress that was comfortable. Then about 2 years ago I joined a gym with a pool and started swimming daily. About a month into swimming I started waking up with back pain below the shoulder blades. I was not sure what was causing this and it was really only happening when I was sleeping so I just assumed the mattress was fucked up.
So I went out and dropped $2,000 on something much better and got rid of the other and wouldn't you know I started having the same pains and it was because I was doing a lot of backstroke in the pool and that muscle was probably rarely used before that and now it was getting abused daily and then when I slept on my side it would throb.
$2k down the drain but I did get a Mattress upgrade