Ask HN: How do you deal with setbacks / frustrations and self-doubt ?

Hi Hn, sorry for the anon post, but i just can't post my actual profile as it is tied to my real identity.

i get a lot of work done, and then there are periods of no-work or complete procrastination. i know that a lot of people go through this cycle, but i need to deliver on time, and this leaves me with a lot to do in a short time [this has really been happening more often now] and it ends up in a lot of wasted time and wasted effort.

as a result, i have missed a lot of deadlines, that were pretty important, and i don't know whether i am capable of doing stuff in a proper timely manner anymore. i used to be able to atleast meet deadlines, but now even that seems to be slipping away from my grasp.

in short how do you [i] deal with this frustration, and the setbacks [missed contracts, connections, wasted time, fruitless efforts, etc] that spring up from time to time.

how do i remedy this ? i really have tried the whole GTD + organization/productivity p0rn, and still sometimes at the end of the day, i am unable to do any meaningful work.

what is the best way to deal with self-doubt ? i know a lot of people here say, "fake it till you make it" and i guess i have tried the approach a couple of times, and sometimes, just sometimes i feel like a fake/fraud. at other times i keep asking myself "do i deserve more ?" and its just a crazy spiral ?

tl/dr

how do you deal with frustration, and setbacks that your [in]actions cause ? how do you remedy [in]action? what is the best way to deal with self-doubt ? and questions such as do i deserve more ? when others less able and knowledgeable than you are breezing by effortlessly ?

i am a little bipolar

thanks.