I Am 41 Years Old. 2013 I Had Cervical Cancer

I am 41 years old. 2013 I had cervical cancer had a radical hysterectomy and in 2014 had complications it caused a incisional hernia. Had incisional hernia repair and got really sick for 4 months. Deathly sick. Turned out it was my appendix leaking and ruptured. I'm still unable to gain weight and have no muscle tone. I have been to cancer doctors and GI and they have no clue why I haven't recovered yet. Please help!