@tsarstepan,
I suggest a little homeopathy:
Saw off your other arm (you can set up a table saw one-handed, right?)
Blend it up.
Dump it in the river, so that the river is "imprinted" with your genetic code. (You saw
Prometheus, right?)
Drink water upstream of where you dumped in the chum.
Wait for your arm(s) to regrow.
You may need assistance with steps two and three.