PTSD here. Majority of the days, I can manage. But sometimes I really can't when there's an episode coming on. It's a lifelong battle I'm sure, but so far medication (in my case, a THC type that's legal here) helps a ton when it kicks in. Although, I've been prescribed controlled drugs to deal with it before. That helped for a while, but I never got into a routine of taking it daily... partially because I'm cautious of psychiatric medicine. I used to take stimulants for ADD (Focalin XD) for 10 to 11 years that progressively got worse due to the side effects and gradually needing a higher dosage. So, I learned to cope with ADD (I'll use coffee if I really need to get focused) and self medicate when I absolutely have to stop an episode.
But also too, I love being outdoors and the sunshine really helps to lift my mood if I'm feeling low. I'll force myself to do things I know I enjoy since depression or depressive episodes tend to make you bed rot. Regardless of the rest of the day, when I force myself to go outdoors (even if it's just 30 mins) I feel accomplished, refreshed and unbothered. So it just depends on the severity. I also have my faith that helps when I read scripture to combat the dark thoughts that pop up. So those things work for me...I also really need to get back into working out. Exercise affects the mood a ton, although it's not a cure all. You'll still have bad days from time to time. Just...never give up.
