I have a question...so my son throws up....no spit up...THROWS UP....he has been doing this since 2…

I have a question...so my son throws up....no spit up...THROWS UP....he has been doing this since 2 months old and is now 7 months....his doctor isn't worried because he is gaining weight...but I am concerned said he should of grown out of this by now...we gave him medicine...breast milk didn't work...different formula....different medicines....it can not feel good to be throwing up all the time!! I need other mom opinions please help :(