Constantly sick

This is my 2nd pregnancy & it has been the COMPLETE opposite of my 1st, mostly for the better. However, I have literally been sick since 7 weeks & I'm in week 14 now. I'm bouncing back & forth between sinus infections with ear infections & regular old colds. I had to do 24 days of antibiotics just to knock out a sinus infection that presented with an ear infection that got worse than anything I've ever experienced (& I've had sinus surgery because of frequent sinus infections in the past, so I'm no newbie). I have allergies & asthma so I'm used to being sneezy, but even that has gotten out of control! Has anyone else experienced anything like this? I know our systems, especially respiratory, are a little weaker during pregnancy, but I'm on week 7 of being legitimately ill & this week has been incredibly rough. PLEASE tell me there's an end in sight... preferably very soon.