Yes, my friend had that issue, she had continuous bleeding for months and they put her on a hormonal solution that stopped it but didn't tell her than when she discontinued it it'd cause bounce back bleeding.
It's safe to take OTC ibuprofen at the max dose on the packet and see if that helps - mefanamic acid is very high strength NSAID (can damage stomach lining, must have it on a full stomach) but in combo with tranexamic, it stopped it dead.
Also, not for everyone I realise, but I have heavy periods, so I take every month tranexamic on my three heaviest days but I also take medicinal herbs the week of my period - Shepherds purse, Lady's Mantle and Yarrow - you can get them as tinctures from Indigo Herbs (I did a load of reading on all this and sent all the studies to my gynae, I have her blessing) - they also do really help. But I understand not everyone shares my view on that.
Hope you figure it out
x