I was advised to take 800mg of ibuprofen (four of the tablets you get from the shops; if you have prescription ones they might be 400mg ones so check) or 900mg of aspirin along with a small can of full sugar coke or red bull and an antisickness like domperidone. There's good evidence antisickness tablets are effective in reducing migraine pain even in people who don't get nausea or vomiting. You can add a triptan into the cocktail if you want. 800mg of ibuprofen is above the BNF dose so I can't really recommend it but it works for me.
The risk of medication overuse headache increases depending on the number of days you take medication on, not how many times you take it. So you are better off trying that a couple of times on one day to see if you can break the cycle rather than doing it one day, not working, doing it again the next day, etc.
It's worth keep trying through the preventers as well. I have done propranolol, pizotifen, topiramate, sodium valproate, amitriptyline and candesartan (think that's it); only propranolol was good for me.
As Giggles mentioned there's also the CGRP monoclonals although last time I looked they weren't approved on the NHS (may have changed).
I've also had things like local anaesthetic trigger point injections, and people do Botox and nerve blocks as well. It's all worth giving a go. I think there's even some half decent evidence for acupuncture (lol).