Do not give up hope. I am 38 years old and have had all of the symptoms you mention. I still have the irritable bowel syndrome a bit and the floaters but everything else has improved drastically over the past year and a half.
My troubles began with diarrhea and elevated liver enzymes. 5X what they should have been. I have done the candida diet, still do for that matter. Have tried some of the anti-fungals recommended for candida. Mostly though reading up as a couple of the previous posts mention under the Ask Shelley forum will help you to learn about how to eat right and support your digestive system. Under the Ask Andreas you can learn a lot about this as well in addition to cleansing your liver and your colon.
Overall I would say that the liver and colon cleansing has been the most helpful to me in regaining my health.
I had some moments where I was close to giving up but I have 3 young kids who need me so I just kept on reading and learning how to heal my body. You can do it too and you have come to the very best place to learn what needs to be done.
All the best to you on your journey of healing.