Over the last two months, I've had so many problems. it started with my recurring colds. I get a cold once a month, and it generally gives off the symptoms of chronic sinusitis (entire left side of head is in pain – teeth, ear, eye pressure, runny nose, etc). Doc says I do not have sinusitis, but prescribed me flonase anyway.

Then came on blepharitis, with occasional flareups. took me 8 weeks to rid myself of it after doing the treatment every single day.
Then comes on the urinary tract infection, which is not responding to antibiotics.
Then comes on another sinus infection.

Right now, I have 4 things – Sinusitis, Blepharitis, a UTI, and a stomach flu.

What the hell is causing this? do I have the scurvy? I spend all of my time indoors, so could it be vitamin d deficiency?

If you did not have your blood levels checked lately, I would advise you to.

You may have a more generalized condition that makes you more susceptible to the ailments you listed. for one reason or another, you may have a weakened immune system. You should try doing things that will bolster your immune system, like adding more vitamin C to your diet for example. Talk to your doctor and ask him what are some other things you can do to strengthen your ability to fight off these infections.

You need jesus

You do need to make sure you're taking multivitamins every day, and lots of folic acid too, about 1600mg a day. at the moment, you're body is very weak.