sleep regression or teething, or WTF?!?

So my son is about 3.5 months and for the past 2 weeks his sleeping pattern is progressively getting worse. From about 2 months on he WAS practically sleeping through the night from about 8-6 without feeding (maybe woke up once for paci reinsertion). But now, he's feeding 1-2x/night and wakes up kicking and wanting his paci (sometimes paci doesn't work that's when I feed) almost every hour. Is this teething or what is this and any opinions on what can be done to help him sleep through the night again???