You won’t always feel this way. Remember that.
Kids are exhausting and studying is quite a commitment too. It’s tough - don’t believe these ‘have it all mommy’s’ on social media, sleek and polished, striding down the street with a mocca chocca gree tea detox chai latte in one hand, pushing designer buggy with a designer baby.
it sounds like you are juggling a lot and it is hard to keep running to stand still.
Get back to the doctors and have a full checkup.
Review your schedules - is there any time when all the kids are/can be at nursery / childminder so you can have sometime to yourself (and to tidy up - that always makes me feel calmer as mess does my head in).
Try to get out once a week for a swim, book club, coffee with friend - make it a set date when your husband is in charge of the kids and he can only call you if the house if on fire.
Make a weekly plan for housework, chores, meals, kids activities/clubs etc so that days are more structured and planned. Chaos is the enemy of a calm mind.
Find your ‘joy’ and be sure you dedicate time to this self care.
Loads of people feel like they are imposters and not as good as others. So that’s a lot of people looking at everyone else and think if their shit doesn’t smell! Noone has all the answers.
One step at a time. Thank goodness the weather is getting better - that’s a mood lifter to start with.
I don’t know what your childhood trauma is - but it wasn’t your fault. Be the parent you needed then now to yourself. Be kind and patient with yourself. Love yourself. Be your own cheerleader.