If you are still getting flushes on the 100 mcg then it is likely that this is insufficient irrespective of what the dosage says it is. Maybe you are not absorbing it, in which case it is not a high dose. Although blood tests are not recommended and docs should go by symptoms, in your case as you are apparently on a high dose patch but still getting flushes it would be a good idea I would suggest. Can you ask for a blood test? Get bloods taken about half-way through the patch period eg after a couple of days or 1 1/2 days, rather than just after a new one or just before patch change.
This would determine whether you are absorbing. Personally I would do this before even thinking about ADs - as these are not indicated for menopause symptoms and you still have flushes!!! Also some women find flushes are worse when taking progesterone so could be the daily use of this is contributing?
Are you in surgical menopause? Also did you say you were in early menopause too? if so even moree important that you have blood tests to tell whether you are absorbing because if you are not - you need the oestrogen so this needs adjusting before giving you drugs like ADs for symptoms!!
Also have you had other blood tests eg re thyroid function to determine whether flushes have another cause?
Hurdity x