Left foot feeling painful

Wondering if any pregnant mummy is suffering from the same issue as me. I’m currently 22 weeks pregnant, and my foot starts to feel painful 2 days ago. I feel that it’s swollen but my husband said it’s not, but it’s dead painful. I couldn’t wait properly or sleep well because it hurts with just a gentle touch. Prior to that I went for a 30mins brisk walk so not sure was it cause by long walking. What should I do with it ? Can I put salon pas?