It's hard to be happy when you have MPS because the pain is physically, emotionally and mentally exhausting. But being unhappy makes the pain worse. I think the first thing to do is acceptance. Denial and being angry makes it harder to manage our symptoms. Be gentle with yourself. This is the best time to love yourself more, to listen to your body, to take care of you, to show compassion to yourself and believe that you will overcome the depressing impact of the pain. Do not wait for others to make you feel better because most of the time they will disappoint us, hurt us.. but still, keep your faith on your love ones, they may not understand what you're going through but believe always that they care and love you. I find comfort and relief in praying and crying to God, reading or listening to Psalms. When pain is worse, it's hard to pray but just crying to God without saying a word, or just saying, "I'm so tired of this pain" over and over again makes me feel better afterwards. Walking in the park, seeing a lot of greens will boost your mood. Take time to enjoy your food when eating, and whatever you do, just savor every moment, I think they call this mindfulness. Everyday, give yourself a treat, whatever it is, just be sure that it's healthy. Strive to be happy.. make more happy memories.. our brain should remember happy things more than the physical pain we have.