Advice ... 17 day period. TMI... advice would be appreciated

So this started last month when my period lasted 15 days in total. Was heavy and ridiculously painful. I went to the doctors at day 13 and they prescribed tranexamic acid to calm it down but luckily It calmed on it’s own.

So then this period come earlier than I anticipated only 2weeks and a few days after the first one finished. After 13 days of heavy and painful bleeding I took myself to the docs again and she referred for a scan because I was getting Perianal pain (pain between my vagina and anus) and also because the period is substantially long again! Well I went for the scan yesterday (internal vaginal scan) and the lady told me that my womb lining was thin so she couldn’t explain why I was still bleeding. But yesterday the bleeding had calmed prior to the scan to a very light bleed, what I’d expect on the last day or two of a period. But since the scan I’ve been having a lot more pin and my bleeding is heavier again, that heavy that I’ve woke up today with blood on my sheets. And changed my pad twice through the night which is abnormal for me to need to do that. But I was woken up by that dreaded wet feeling. I’m also suffering with awful lower back pain, cramping and feeling nauseous.

My question is should my period still be this heavy on day 17 and should I take myself to an Emergency docs/A&E today because of this. Picture below to show how red and heavy it was yesterday. 🙃

Thank you guys for any help.