Laced Weed?

Okay so like all my other fellow stoners, I love weed and frown upon other drugs that are actually dangerous. Well one day, My 'friend' was like, "Hey man, wanna smoke?" So of course I obliged and he came over and we rolled 2 joints. I didn't notice anything odd about his weed except the fact that it was really broken up. I didn't think much of it but I asked him where he got it from. He said he found it in his brother's room and took it because his brother had been taken off to jail for a good time. But his brother is a known tweaker, a.k.a 'Meth user' around the area. I have heard of meth users smoking weed to help relieve their comedowns. It wasn't some chronic, more like some mids. So we kept smoking and I started getting a headache. We then went to my friend's friend house who was also a meth user and smoked weed for the comedown. We were smoking another joint when his friend said, "It tastes like meth?" And I said, "I don't really taste anything, are you sure?" And he said, "Oh I think it's just because I just got done smoking it so the taste is still in my mouth." So we finished off the joint and smoked a few bowls out of a bong. I didn't feel a different high or anything, just that crappy outdoor weed high. As with any marijuana high, I started getting the comedown, feeling tired, but my head was hurting even more. I felt like total crap, nauseous, with a headache, and extremely tired. I decided to go home because of how horrible I felt and as soon as I got home I think I fell asleep, I can't really recall. I woke up the next day feeling worse, exactly like if I was getting a cold. I went to the hospital and was asked if I smoked, I said no because my Mother was there and I didn't want her to know I did. The nurse said she wanted to know because smoking could be the reason for my cold. They took my temperature and blood pressure and everything and concluded that I had an upper respiratory infection, also known as a common cold. So I went home and felt like crap for about 2 more days until I finally recuperated.  Could it have been that his brother's stash could have been laced with meth? I heard you can't lace weed with meth because it just melts. But then again, is it normal to get a common cold from smoking weed? And if it was laced with meth, wouldn't I have been awake and up for sometime? Oh, and also, my other friend didn't really seem to get a different high or anything either, but he has experimented with meth before himself, just like his brother.  I'm terrified of even having the chance of smoking that crap, it's been bugging me for months and I'm really depressed from it, It'd be glad to hear some of your guys' insights on this, Thanks