Suggest Treatment For Itchy Bedbug Bites All Over Body

I have very sensitive skin. I was at a hotel almost 8 weeks ago and woke up with severe bites and discovered bed bugs. I believe I had an extreme allergic reaction, I have taken antihistamine medicine, applied aloe, coconut oil, and a weak cortisol steroid I was prescribed for my mild eczema and sebhorric dermatitis. There has been scratching as well, which has resulted in a few open bumps and scarring. I haven t scratched in over 2 weeks. Sometimes they still itch a bit,but I have abstained from scratching, the bites are now drying,but they have yet to fully heal. What could be the problem... is my immune system weak? It has been 2 months my bites have improved but why haven t I fully healed?