Unfair management treatment

(Or at least one of mine isn't) So basically I had a seizure at work last Tuesday at about 5am (my IPH was 210 and I was very sad I ruined it) I collapsed on the floor, with 2 colleagues near me to witness it. They made sure I was safe, called a manager and put a jacket under my head. Only my manager (shopper) was in, and he is lovely.

An ambulance was called as well as my partner to come pick me up (before I had woken up) When I woke up, I spoke to the paramedics and cancelled the ambulance because someone definitely needed it more and my partner could drive to A&E faster if needed. I also ironically had a doctors appointment already for the following morning, which my manager (let's call him Tom) knew about. Tom told me to go home, and said I didn't have to come in for my next shift, which was today, as my health was more important, and not to worry about how much sick leave I had left. I did go in, and only the main manager (Alex) was in.

He pulled me in for a meeting, pretty routine. Asked if I was okay, and then proceeded to basically tell me off for 15 mins. He counted it as my 3rd absence, forwarded it to a formal meeting, and said he'd probably give me a disciplinary. Exact quotes: 'Did you choose to go home' 'No, they even called an ambulance for me' 'But did you leave in the ambulance' 'No' 'So you chose to go home' 'Uhhh but Tom said I should go home' 'Did he advise you or tell you' 'I can't remember I had literally just regained consciousness'

Anyway, I left an immediately just started crying. I've been struggling so much anyway and this just felt like a kick in the teeth. To make matters work, Tom is now off for 2 weeks so I feel like I have no support. My colleagues said If I wanted to appeal it they'd come to the meeting as witnesses. It genuinely made me want to hand in my notice. I've been there 2 years and I'm the fastest shopper, it just goes to show management literally doesn't have a soul sometimes. I'm so fed up with the system at Sainsbury’s, I'm tempted to start looking for another job while I think of leaving.

TLDR: I had a seizure at work and my manager counted it as an absence and plans to give me a warning even though I'm 99% sure I was sent home and didn't really have a choice.

Kind of just needed to rant. Never want to go back. I have blood tests Tuesday and more tests but apparently that's not enough for them.