<human>: To give you an idea how I'm feeling, I'll explain my history with him. I've grown up with him on and off up to 15 years old. I'm now 20. Since he was in his 20's he's had a huge meth problem. After I turned 15, I decided to live with friends/family friends and now with my fiance and our son. Since then, I have tried to keep him in my life, but he hasn't really even wanted to much, and I personally don't want my son to be around his grandfather at all while he's using drugs.

Now, There has been a time where he called me, high off of his ass, and has told me that there was something crawling inside his body. I went to see him, and he wouldn't except any medical care. But this time, he wants it, and he doesn't sound like he usually does when he's high.

Can you condense the text into three sentences or less?
<bot>: My dad has been a meth addict for the whole 20 years of my life, and he won't get help for "Something crawling in his body" without my help. What should I do?