Hi J.!
Please don't worry about your son....he sounds perfectly normal :o) How normal? So normal, in fact, that when BOTH of my boys were that age (and a little older) I had to carry a SIGN that read "Sorry for the noise, tantrum in progress".
Like clockwork they would have a tantrum in the grocery store! I was so embarrassed! I had to shop at 4 different stores so I didn't "bless" the same store with all the tantrums!
Anyway, once they saw my "sign" along with my reaction (trying to act like I couldn't hear them)...Both of my boys learned that it doesn't work to get mommy's attention to scream like that. They would try different places to have tantrums, but I reacted the same way. It DOES go away, but it takes ALOT of self-control on the mother's part :o)
In just a few more months (but you could start now), he will understand if you tell him "Mommy wants to hear why you are sad, but I cannot understand you until you stop screaming, so tell me when you are done screaming and mommy will listen and hold you", then go about your business (again, pretending you cannot hear a tantrum). It will work, J., just be brave :o) It won't take that long, only a few months for him to try, try, try, :o) I swear, kids try the same things 50 times before THEY'VE decided to give up because it's not getting the reaction they had hoped for :o)
About the language concerns......again, very normal. My sister used Basic Sign Language with her boys starting at 7 months old. Truthfully, I thought it was silly (at first), but when I saw my 7 month old use his hands to say "more" when he was in his highchair, I about cried! It really works and helps communicate between parent/child.
She has a simple book, nothing to read, only signs. Everytime she does a "sign" she says the word that it means, but to not confuse him, she waits for the "signs" for when they are needed. Like, when he's in his highchair and starts getting cranky because his tray is empty :o) She signs "more", says "more", and puts "more" on the tray. If he's still cranky, she signs "drink" and puts the drink on the tray.
I am witness to it working, and if I could do my boys over again, I would've added sign lanuage into their lives. One of her sons is now 4, and doesn't use any "signs" now because he can speak for himself. But before he could speak, he knew over 30 signs to help communicate. The Trick is to "study" the signs :o)
Anyway, I believe your instincts are right about giving him "Timeouts".....always listen to your instincts.
My mistake, as a first time mom, was to "get everything" for my son before he got cranky, he only had to grunt for anything and I would be there :o) This prevented his language from developing. I never gave him the "words" to learn language. So, I share this with you in case you are doing something similar. If he wants his truck on the top shelf, then tell him, "say, truck please" and get it for him. ALWAYS give him the words to use before you give/get things for him. He will learn language.
Waht a good mother you are to worry about your son in such a loving way. He is completely normal and will be just fine with a terrific mother like you :o)