Another grades question....

This past weekend my back was injured. It is looking like a lot of time is going to be spent in therapy and other stuff over the next few months. The appointments are of course during the day, and the evening classes are full. Should I consider taking some W’s and going back at it once my back is back to normal? My fear is that I miss some lectures here and there, or miss a lab practicum, and drive my grades down. I’m not 100% sure what is best. Any suggestions?