Hurt my elbow using a heavy racket?

So I had an initiation racket that weighted around 165 grs for 6 months. Bought my first serious racket 2 months ago since I was getting better (Tibhar Alexis Lebrun Off / FH Xiom Vega Pro / BH Xiom Vega Korea). It weights around 195 grs.

I immediately noticed discomfort in my arm after the first few sessions. Trainer says i just need to get used to it but after 2 months now i can't even move my arm!

Went back after some time off to a 150 grs old racket with no grip whatsoever and really slow (half anti maybe) and played in a defensive way. I don't know how but I managed to win to a few players I couldn't win before with my previous setup. I was amazed! Arm even felt better.

What do you recommend me to do? Go back to a lighter setup? I was thinking an offensive short pips (Victas 102) for FH and maybe an anti for the BH. Don't know about the blade though.