I didn't run while I was abroad for a month on a business trip and didn't have chance and time to run there. I was pretty eager to get back to running when I came back. So as a result I overdid it and my left hip started hurting after each run.
I guess it shows that I still need to work on my running technique. And also need to not skip warming up before the run and stretching after (the time is tight in the mornings sometimes so I was allowing myself to neglect these from time to time).
For professional help, I am seeing both a massage therapist and a chiropractor. So my hip has been improving and I am back to running on somewhat smaller pace and timing, but I am happy to run again.
Interesting enough at very beginning of massage sessions my therapist suggested me to add a foam roller to my daily routine.