I understand where you are coming from. Hormones and a surgery seem to be what brought waves to my straight hair in the first place. I have similar properties to you and I have had great luck with the gelatin PT.
I also have success with using my products on soaking wet hair and then diffusing so it doesn't fall flat. The gel I use is a hard hold gel but it scrunches out well and my waves/curls last for a couple days.
I agree with Yoshimi though, pictures would help.
Low/ Med porosity
Wash: SM MR, GTTT
RO: SM MR, GTTT
LI: SM CSM or SM MR
Styling:AVG, KCCC, Volumax MEGA (HG), Joico Curl Definer