You need to seek a doctor bud. The chunky and color should of been the first indicator, just saying.
I'm a fit guy that eats pretty healthy though. lots of salad and sometimes fruit. when i have this issue, its like its thicker or chunkier and has a tint of yellow instead of straight white.
Hold off on anything with caffeine in it as well as limit your amount of masturbation. Try to maintain a healthier diet with at least some veggies here and there, red meat may help with flow as well. Just as a note the chicks dig guys who eat healthier, Why you ask <- Cuzz it makes your sperm taste better. If you have any follow up feel free to contact me on here. This however should help you. Give it a shot and see what happens. Limit it all don't forget that.
It's all in your mind. Don't touch your penis for a month and allow time to clear your mind because you worried too much.