Does this sound like hypoglycemia?

Background: When I was younger, on father's day I passed out reaching for a box of cookies. I was young, and it was about 1 pm, and I hadn't eaten all day, and I stood up too fast I suppose. I was between 11 and 14. Also, I've had hypothyroidism since I was born. Those are the only relevant medical things I can think of.
Lately, if I don't eat before 1 (I wake at like 930 usually), I start to feel faint, dizzy, shaky, and I'll have to sit down so I don't pass out, sometimes on the floor, which is embarassing when I'm at work or in public (this has only happened like 2x in public, usually it's my house, so there's a seat always nearby). BUT, lately it seems to be getting worse. I feel panicky, like I'm convinced that I'm going to pass out and no one will know and I'll die (I know, it's dramatic, but if I'm alone, and hit my head, it's possible, besides I'm just expressing the thoughts that go through my head, in case they help I suppose). I start to convince myself I can't breath, and my bra starts to feel like it's suddenly really tight and weighing on my chest. I realize what's going on, go to the kitchen (after a break from the 20 foot walk, pathetic), and have an apple. While I'm eating the apple, I often feel like I don't have much control over my mouth, like I can't take big bites, and I have difficulty swallowing. I feel incoherent, shaky, and like my responses and reactions are sluggish. Sometimes my vision starts to go black, this is when I sit. But once I eat the apple, I feel fine (ish, depending on how bad I got).
I have fairly low blood pressure as a standard, usually 115 over 83 or something seems to be my most common, it's technically normal, but barely.
I just had my thyroid checked 2 weeks ago, and it's normal (with my meds). Also, at the moment I'm on the 2nd day of my period.