Hormone imbalance?!?

Sorry this may be a little long as I've been dealing with this for a long time.

Every month I get nausea after my period, it always starts 3 days after my period ends and lasts usually 1-2 weeks but has lasted until my period starts before. During this time I struggle to go out and have to keep a bucket or bag with me as I constantly feeling like I'm gonna gag at any moment.

This started a few months before I got my very first period when I was 15, I'm now 24.

My mum just told me that it meant my period would be starting soon and it would go away.

My period started and it has continued ever since.

For years I put it down to anxiety, until a few years ago I realised it happened the same time every month and I now think it's a hormone issue.

I do get other symptoms as well as the nausea however the nausea is the worst. I get fatigue and I also get a bit of an unset tummy aswell.

I had a call with my doctor and was told that they have never heard of anything like it before.

I was told they couldn't look into it until I was able to make it to the surgery (I was housebound when I spoke to them, I have improved since then but still am unable to attend a appointment at the surgery).

I'm just wanting to know if anyone here is dealing with something similar or have heard of anything like this. I'm feeling very alone right now. I've googled for hours and have found nothing.