it should come back slowly if you stop using drugs, including alcohol. Personally, I get the same thing or very similar experience from weed alone- high or not. Throw alcohol into the mix and I'm either fully turned up or can't speak at all.
I've noticed that weed makes me very introverted(even more so than I already am) and constantly questioning everything I say. I lose the ability to trust myself and have to double check everything, so when it comes to speaking I feel like there is a filter that everything must go through first before I find the confidence to say it. In conversation, a lot of thoughts or ideas wind up getting lost and I find myself trying to pay attention to what is being said with nothing to say back to them because I'm trying so hard to focus.
I've smoked so much (nearly all day everyday for the last 7 years and counting) that when I am not high I feel so uncomfortable or unstimulated that I can't think of much to say. Also, I find myself questioning my thoughts almost as much when I'm high because of how weird and uncomfortable I feel.
You say when you subside from smoking weed the problem goes away... well, my guess would be it is the weed.
Weed gets a reputation as being "harmless" because it is practically impossible to die from too much weed. However, based on my first hand experience with it and what I've seen in my friends, I have no doubt that there are MAJOR side effects and that to say the side-effects from smoking weed is benign is complete ignorance imo. I once believed it was harmless, used it all day, and couldn't figure out why I was having so many problems that I didn't have before daily usage. You might not empty out your savings, sell all your possesions and start stealing from your family for your weed habit, but I've quit a job, lost friends, and spent a lot of time locked alone in my room so I could get stoned. I've seen a lot of friends do the same.
Life is precious. Even though it may seem like the side effect is minor it may have major implications on your life. Our brain is a delicate tool, start messing around with the settings and you might not be able to predict the outcome.