My 2 month old was very fussy last night. He was up from 11 p.m to 7 a.m., he was sleepy but…

My 2 month old was very fussy last night. He was up from 11 p.m to 7 a.m., he was sleepy but couldn't go. He even cried/fuss when he passed gas. He didn't want a bottle and we made sure his pamper was changed. Does anyone know what was wrong or how to help. I gave him gas drops also. He does a lot of straining also but isn't constipated.