Hi
Sorry to hear you're struggling - and hope you enjoyed the (1 day of!) sunshine over the weekend
If HRT helped already, it's probably worth trying a slightly higher dose - 50 is still lowish. As Hurdity suggested, I'd go up gradually - try 62.5 for a few weeks before going to 75 if it's not helped or has helped a little. For me personally I'd rather ask the doctor for 25s and cut those in half than faffing around with cutting off pieces, but maybe I'm just simple! Despite myself having been pushed to MUCH too high levels (like 300 patches) and was made very ill by those, 75 is not a high dose so I don't see why you wouldn't try it if your BP allows.
One high BP reading can happen for all sorts of reasons and shouldn't preclude HRT - they should recheck it! Most doctors will (should) do a BP check annually on HRT or when increasing dose, so unfortunately that may be unavoidable - much though I sympathise with not wanting to go back to GP. If you feel your BP might be higher there because you are stressed there, they should agree to give you an ABPM (ambulatory BP monitor) for to wear for 24 hours eg when chilled in your garden, to get a better reading. And if they then / still refuse to give you more HRT, I'd push for a referral to a specialist meno clinic as there may be alternatives.
Unless the guidelines have changed (again) very recently, there's no need to inccrease your utrog dose on patches of under 100.
Hope that helps xx