Sheilasue, my deepest condolences. Losing a child, even an adult child, is the worst possible thing I can think of. My heart is aching for you...
TrishaJ, I understand why you're wondering about ds lack of contact. Perhaps he is just busy, as others have said, or maybe he doesn't feel you "sorted it out" or that you two are "fine" the way you do. Refusing to answer messages, blocking on facebook (you didn't say that, I know), etc. are all part of a tactic today of going nc (no contact). There is a whole thread here about it. Sometimes,it's temporary, just till the son or daughter works things out in their own mind. If ds is deliberately ignoring you, hopefully, it's just temporary with him. When you sorted things out, did you apologize for whatever it was that upset him? Did you make it clear you wouldn't do whatever it was again? If not, maybe he still needs that, Idk. Regardless, I agree with pps (previous posters) that you should now just wait till he makes the next move.