severe gas pains

These last two days I've been getting "gas bubbles" and I can't pass them for a while. Last night when driving home from work they were so severe I was doubled over. As soon as I got home, took off my pants and laid down the pain went away and I could pass a couple of them. I think partially what may have to do with it could be my pants are too tight and it's time for some maternity pants... but yes it's been a struggle these last couple days. Any advice or fellow struggles mommas?