Well ,the fact that I don't have girlfriend is a big part. I don't know how to make time for one. There are many ways to deal with stress. I use breathing techniques to moderate my stress levels. These are both great suggestions.
Breathing techniques are easy and can be done anywhere.
Vigorous exercise for even 15-20 minutes each day can make a difference. My girlfriend uses aromatherapy an excellent source of stress reduction. I find this to be particularly helpful. Just take a few minutes to relax in the middle of the day and imagine that you are somewhere very peaceful. I travel , and I listen to music a lot while I'm on the road.