3mo sleep regression?

Hi girls, I’m a first time mom with a 3mo baby boy, he got sick with RSV 2 weeks ago (he’s fine now though) and ever since he’s sleeping poorly, he was doing 3-4 hour stretches at night and increasing before getting sick and now he’s waking up every 2 hours, he eats very little and many times both from nursing or bottle and then has a lot of difficulty having a deep sleep. I’m exhausted and frustrated because I’m the one waking up every time and doing all the care during the day, my husband works and only watches the baby 1-2 hours in the afternoon.

Do you think this is sleep regression? Any tips to make it better?