How to rebuild immune system and prevent hair loss after multiple cancers?

Hi i had 3 cancers 1st one 3rd stage uterine cancer had a full hysterectomy at 50 right when menopause hit that is another story anyhow the Dr did a biopsy on all my organs while doing hysterectomy without my consent he spilled it on my lympnodes on hip so i trusted in the Drs to save me help me . I had to do chemo and radiation i wasnt even healed from the surgery so i said its my body i will not do both treatment at same time also i will start chemo first after i completely healed up from surgery , as i started chemo i met and researched about cancer went to a wellness retreat learn more and i also learned enough to not finish my chemo and denied radiation, i was scared and did not trust the Dr, s that was my so called team they just making $$ another dallor , then soon after i was done i was told to go get colonastify for my age i was reluctant to do it i was thinking there going to put cancer up me while im down and i was very scared , sure enough i went home in tears scared for my life telling my husband i knew it i told you that was going to happen i had colon cancer had made sure i wasnt going to have open surgery so i got microscopel surgery everything went well i geuss didnt do any pharma treatment i wouldnt of even if i was told to . After learning so much hearing rumors of population control and more. 8yrs later im getting a MRI for hip replacment they spotted a mesh in my colon reacurring colon cancer i was referred by the chemo Dr to a buddy of his that does colons well that Dr was really not paying attetion to my fears and needs he said he had to remove my colon i said he out of his mind and no way will i let him do that after that i was deafly scared got so sick depressed my husband decides to leave me at this point i said let nature take its course before i walk around with a shit bag hanging out my stomack so i got a second opinion san Francisco cancer center she ask what i wanted i said just cut that piece of cancer out and leave it at that . Well its been almost 2 yrs i get scared sometimes i pray i never have to face cancer again . Only thing now im losing hair going bald a immune deficiency. Is there a natural way in helping building my humune system up to normal or loss of my hair. Diets to stick to keep colon clean ??