I get a total body massage every-single-month. It is pure heaven. I've been indulging/rewarding myself for 15 years or so.
The whole experience, from the moment I look at the appointment written on my calendar, to driving into my massage therapist's driveway, to walking into the room (soft music playing), to the "laying on of hands" is the best gift I could ever give myself.
What do you do for yourself? You deserve something, you know. Something just for you. Maybe a mani or pedi? A new hairstyle? How about a facial? BTW, these options are also for men.
I got a pedicure just before we went to Florida. It's not something I do often but, you know, had to get the tootsies perked up. I left for my month with screamin' red toenails. Dang it - should have taken a picture.
Honestly, back to the reward/gift thing. It doesn't have to cost money. It could be something as simple as going out for coffee with a dear friend and spending uninterrupted time catching up. A walk in the forest or a stroll on the beach. Try to do something just for you on a monthly basis. It really gives you a "treat" to look forward to - it's a gift you give to yourself.