I can't help with the speeach therapist, but I have an idea you can try for potty training.
You will need to dedicate your day to this, so if possible, try to find a babysitter for Zackery for a day. Start in the morning with Camron loading him up with LOTS of liquids. Then start taking him every 15 to 30 minutes to the potty. (You may want to consider using regular cloth underwear this day so he can feel and you can see when he goes.) If he doesn't go, say "that's ok, we'll try again later", but give no other attention or affection. If he does, literally make it a party! Sing, dance, get some party hats and balloons, maybe even a cupcake. Call Grandma or an aunt or uncle, someone he loves, and make a big deal about it with them (you may want to prepare them in advance!), and even call one of his favorite cartoon characters (Elmo, Thomas the Train, whoever... obviously a friend or family member who can pretend on the phone.) REALLY make this a HUGE deal so he will WANT to do it again. Now of course, you can't do this EVERY time he goes, but do it the first time, and then gradually subdue the "party" each time after that during the day. I bet that by the end of the day he will be going by himself. On following days, continue to really praise him and show him plenty of attention when he uses the potty so it will continue to be something he is proud of and associates with happy times.
Now if you think you will have trouble getting him just to try the first few times, one thing that may help with that is the "potty training Elmo". You can get it at Toys-R-Us and I think Wal-mart. It comes with an Elmo doll with removeable underwear, a toy potty and a potty-training book for Elmo. When you press the hand or whatever to turn him on, he says he's got to go. If you get his underwear down and sit him on the potty in time, he cheers and plays music. If not, he says something like "Oh oh, maybe next time." Anyway, this might be a way to encourage Camron to try.
Well, I hope this helps. Good luck!