It can be hard, very hard at times. But your child needs you.
Find a shoulder to cry on, let it all out, and then come back with renewed vigour to help support your trans child. Lean on people who will truly help and support you, and lean away from those who can’t or aren’t able to. Seek out professional help if you’re able to, and ask to be part of true support groups. You may feel alone but you are not, believe me.