It's not renaulds, renaulds is localized vasoconstriction, not generalized. Sure meth causes vasoconstriction and because of that, blood flow to extremities is reduced, but circulation is surely not cut off. And the lack of feeling has nothing to do with poor circulation, when I use recreationally, I touch things with my hands and don't feel shit, hot water feels cold, cold water feels hot, and I can keep my hands in hot water for an hour, I still won't feel shit, because it's not circulation, it is a centralized signal saying "I'm no longer interested in receiving signals from hands and feet for now, I'm busy with other things", so where is the question of you having a rare disease?
If you get blisters and other skin issues, it's because of bacterial infections or because your meth contained mercury, red phosphorus, palladium and other catalyst material or impurities that they couldn't filter out. Meth by itself, in its 100% pure form does not cause blisters. It's not peripheral neuropathy either, it's your brain making a conscious decision not to receive nervous input from extremities, because it has better things to do at that particular time.
Your expectations are completely wrong. Everything you complained about in this topic, minus the potential bacterial infection, you should be expecting to occur during a meth high. You need to establish a set of expectations so that you're not surprised while using. You can't expect to be sober and feeling normal/looking normal in the midst of a meth high, it's not going to happen and it's surely not a problem. You can hear voices see people, watch Police break the door and place you under arrest, you can smell pancakes or feel like your hands are wet when you look they're dry as woodchip...and you have to realize that this is not actually happening. If you can't do this meth is not for you.
On meth, you'll look like a corpse mate, like a zombie or undead, on meth you'll look like you crawled out of the cemetery and its perfectly normal to look like that. NORMAL. I'll say it again, NORMAL. That's our expectation.