Re-claiming ESA

I was on contribution ESA for 5 months and left to start a part time job at 16 hours. I found the job too demanding after 2 weeks so have had to leave. I feel I might be able to carry out work if it wasn't so physically demanding as this one.

So can I make a new claim for contribution ESA as I am clearly not as ready to return to work as I thought?

Or should I start claiming contribution JSA instead?