Mixing meth and downers frequently

[The Kid]

I smoke crystal meth pretty often, recently it's been almost daily. I love the effects of the meth except for the not being able to sleep part. I have always had a thing about being the only one awake in the house without anyone to talk to, and the later it gets the more anxious and depressed I feel. sometimes I just tough out the night but often I take an ambien or a valium to go to sleep. I heard that frequently switching from uppers to downers can be exceptionally hard on your heart since your heart rate fluctuates frequently. I was just wondering if this is in fact true, so if anyone can give me some advice it would be greatly appreciated. Thanks!