Could I have low blood sugar?

I had a very scary incident on the bus on my way to work yesterday. I passed out briefly. I've had a handful of episodes like this happen before since my surgery, but they always happened after something like working out. However, this was so sudden and rather embarassing since it happened on a public bus. Could this be from low blood sugar or hypoglycemia? Here are my symptoms: It always starts out by me getting incredibly hot. Then I start sweating profusely. Then I feel pins and needles throughout my body. The color disappears from my vision and things start to seem far away. My hearing is impaired also. I also feel like my bowels have turned to water at this point also. Then, I either lose consciousness or come very close to it. I feel very weak and light-headed for the rest of the day. I had my surgery a little over 9 months ago. I had a starting weight of 324 and I've lost about 150 pounds so far. Thanks for any info anyone can give me. I did make an appointment with my PCP, but it's not until March 3rd.

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