Running away no. Taking a break, stepping back to gain perspective absolutely.
Shortly after Dday I remember fantasizing about going to a hotel, and sleeping in a perfect bed, without snoring, or anyone to sleep with. Fortunately my kids were old enough I could leave them home alone for short periods of time. I would almost daily go for a walk in the woods. It helped me to burn off the anxious energy, and gave me time to think without distractions, or even better gave me an escape. I would put my headphones on, crank the DMB on my Ipod, and not think about any of what was going on the whole time I walked, I would focus on the music, and the beauty of the woods surrounding me.
Please take time, be kind to you. Use work as a way to turn it off. Think of it as an escape from the constant worry you are experiencing.
Plan some time each week for just YOU. No kiddo, no spouse, just you. You deserve this.
Please don't feel rushed to make a decision on how to proceed. Get your STD test, see a lawyer, watch his behavior and go from there.