Please advice - severe hypotension linked with exercise and monthly cycle

This is the second occurrence I've have this year of these episodes and theres 2 common factors each time.

• I'm on a normal training run and;
• its just before I'm due to start my monthly period

I should add I run and train regularly with no incident and consider myself physically fit

First occurrence - roughly 3 months ago had a 3 mile run planned, was 1 mile in and started to feel unwell so sat down on a nearby bench and decided it'd walk the mile home, started feeling even worse had to sit down every couple of metres got to a local fast food chain and contemplated asking for an ambulance I felt that bad, my hearing was going and I knew I was about to faint, didn't have my phone on me to call anyone. Sat down had a chocolate bar and water (was thinking it could be blood sugar) and some ibrofen for lower stomach cramp like pain. Recovered in roughly 15 minutes and walked home.

Second occurrence - today, had a 2 mile run planned, got 0.7 miles in and decided to turn round as was feeling unwell, ran back, had about 300 metres left and had to sit down. Felt like i might thrown up I ran down the hill to get home as fast and I could, felt like I was going to pass out again, lay on the floor. Home this time and curious if my blood pressure was low, my mums got a home machine for high blood pressure, I (barely) took a reading stood up. It was 78/26, I lay back down and it took about 10 minutes to recover, both times i have not an unbearable, but a definite lower abdo pain, which passed without pain killers this time.

What is physiology going on? Would a trip to my GP warrant investigation or is this just something I should manage (e.g not running just before i'm due on)

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