Thanks ladies, it's been a surprise as I've been back on the HRT for 4 months now. (Started with 1 pump gel, moved to 25 patches 2 months ago)
It's just really frustrating as I was doing SO well on the gel until the migraines started again, and although they have not reoccurred with patches, the patches are not making me feel as good, and I've had odd side-effects. I have a GP appointment booked next week.