Homeopathic immune boosters?

I had scoliosis surgery a few years ago, a got MERSA and managed to work through that with IV antibiotics and they re-opened the incision twice to clean it out. After i got off IV antibiotics I went down hill, it turned out I had a second infection that required the rods to be removed and a different set of IV antibiotics. It has been almost one year since the hardware was removed and I still struggle with poor appetite, therefore making it a struggle to eat what is best for me. I am supplimenting with several things to boost my immune system, I am also taking Iron, Mg, Ca, Vit. D. Greens, echenacia, Noni, and a liquid vitamin with Noni. It all taste horrible but I want to be as strong as possible. After all, my surgery was a success, the infections were the problem. What are your thoughts on all of this? Do you think I am doing the right thing by adding immunity help. There always seems to be this struggle between Dr's and adding homeopathic, natural suppliments.