^no, you most certainly aren't the only one with the coughing...
personally, the worst part of being dopesick is when your significant other who doesn't use sees you in such agonizing pain, and really makes you question your use of opiates/opioids...
but then you continue to use anyway...
example: i'm on pain management for my shoulder(and have had an addiction to opiates/opioids on and off[mostly on] going on six years now), and my girl would really rather not see me on the pills, but she knows that it's more beneficial for me at the moment to use than not to use...but still, every time, i run out early and i get sick, and she takes care of me through it, which makes me feel absolutely horrible for having to use...
it's early, i just got my dose and i'm still semi-sick, so if this doesn't make sense, my apologies.