There is something wrong with me! Help please!

I have been feeling bad for awhile now. I have stomach issues. When I eat, my stomach makes ungodly digestion noises. It's not gas, just a loud rumbling and this is after I eat, so its not a hunger noise. I also feel gurgling in my throat, have excess mucus too or feel as something is in my throat constantly. I have pimple like bumps that appear on my scalp that never go away. My hair is thinning rapidly. I am constantly tired. Any ideas as to what it is and what I should start with. I just got bloodwork done and the only thing the Dr said was I was pre-diabetic and to get my Sugar down. Any advice is appreciated. Thanks.