Do I have candida overgrowth?

I am 19 years old and am very fit. I've always been athletic, but the past year I have been very busy and wasn't able to continue my runnings/tennis/etc.
Last month, I started having headaches (mainly tension headaches) and my neck and shoulders started hurting and being stiff. The doctor thought nothing of it.
2 weeks ago I started burping like crazy. That stopped after a week, but i had a feeling of having a lump in my throat. The doctors said i had acid reflux and gave me a diet to eat to heal my esophagus.
The only problem I have with all this though, is that I've always eaten good foods and almost never eat sugars or fast foods. I've never once had a problem with excessive burping or acid, even after eating large amounts of spicy foods or citrus foods. This was just completely sudden and unexplained.
After research, I have started to wonder if I had candida overgrowth. I had acne throughout middle and high school and still have a few bumps in college but they're pretty much unnoticable. I took antibiotics for the acne almost every day for a couple years (before I found out how bad they were). I've had sinus and allergy problems my whole life, and was diagnosed with sinusitis last week when i was diagnosed with reflux.
I just refuse to believe that at 19, 120 pounds, and a good eater, I could suddenly get acid reflux for no reason at all. I haven't noticed any heartburn or any trigger foods. I have, however, noticed some chest tightness, but I'm pretty sure that's related to my shoulders and neck being tight.
I tried a spit test this morning and it appeared to be positive, but I know that that's very very unreliable. ANyone have an opinion or other ideas?

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