When I first starting wearing my hearing aids, all noise sounded "tinny". After some time using them (a month?), my brain started to compensate for
how I perceived sound. When I first start using hearing aids, I became very aware of a lot of everyday noise that I really hadn't heard for a long time- refrigerator sounds, running water pipes in the walls, distant traffic, even leaves blowing down the road. It was overwhelming at first. My audiologist recommended that I put the aids in and leave them in-not to just use them for selected situations. I did have him make some adjustments at first, but the only thing that really helped, for me, was time of use. I know that I probably do not hear sound like somebody with normal hearing, but once I got familiar with my aids, the tinny sound became my new reality and didn't sound tinny anymore and now I really do not perceive what I hear as abnormal.
I play my guitar and fiddle and never give my perception of sound a second thought. Have the adjustments made as suggested, but put the aids in and keep them in. Hopefully, with time, you will adjust.