It is a completely normal developmental stage that babies go through at this age where any previous *good* sleeping habits go right out the window along with our sanity LOL. Some babies will get past this stage without so much as a single sleepless night and others will play holy hell. My own baby hasn't had a solid night sleep since he was 5mths old - due to teething and discovering that the world is bigger than just me and him.

Have you considered investing in a sling? if he likes to go to sleep with motion, then maybe this could be the answer because you can just pop him in and keep going about your daily routine yourself. You wont spoil him by 'wearing' him and it will make him feel secure too.