Low Blood Sugar 6 months post op

I am about 6 months post op, and maybe starting at around 4 months I've been having dizzy spells, shakiness and weekness. As best as I've noticed, this either occurs during the day when I've had a lot of water or after I work out. There are some parts of the month (seems like maybe when I'm ovulating) that I feel REALLY weak and have a hard time even with the simplest workout. Oh and the other time I see this is if I eat something and dump, and then later have a wave of feeling weak after I already start to feel better from the dumping. Maybe what's happening there is that my blood sugar shoots up and then plummets down??!? Recently I tested my blood sugar and found that during a weak spell (not after dumping) it was about 50. My fasting blood sugar has been about 70ish. Anyway, I wondered what could be causing this. Does anyone else have this problem? Does anyone (well, ladies only of course) see it tied to their cycle?

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