I lost pleasure in my anal masterbation.

I agree. I say try pleasuring without vibration on for a really long time, or you can do like I do sometimes, sometimes I sit on the toilet and just rub the anus without penetrating, then after a really long time I will touch my penis(sometimes at the same time I am touching my anus and sometimes not), I will have great miniature dry orgasms, then I will return to just touching my anus. Sometimes I will stand up and touch my penis, after a while I like to lightly squat and rock my hips forward and backward and around in circles. Mix it up. But the higher vibration is great every once in a while. The vibrator I have has 10 settings, the ones I like the most don't have a constant vibration but have pulses. One of my favorite dildos doesn't have vibration but is beaded, is really floppy, not that long at all, and not that thick either. I like to stick that in and leave it, then very soon after my ass will start kicking it out, I keep my hand ready for it to pop out a little to push it right back in, so one bead pops out and in over and over.