Yes I have been there (still there now with teens that are twice the size of me) Op, I have the tingling feet and other things too - I was also told by the GP that it is 'extreme stress', brought on by the lockdown and will clear up of its own accord. I find it gets much worse when the children kick off, and I feel overwhelmed, it is not pleasant.
Can I just say you sound exhausted, not a bad parent.
You have not had a day off since Christmas!! In what sounds like a very responsible and full on job, and the only day you are taking off you are now camping?! You are better parent than me! I would have checked into a spa hotel for several nights with some treatments, a kids club and some wraparound care. Are you not able to book anything that will take the edge off your tiredness? There is still hotel availability when I checked last night. Camping is hard work, and likely to make you feel even worse....
Personally I have been in your place, and this is what I did, I am not sure of your financial situation but quite frankly this is an emergency if you can find the money, then do:
You need cleaning help, if you have it, then increase the hours so your precious time off is not wasted with the chores and you can focus on the dc. Even if its just for the holidays
Book a spring clean day if you can stretch to it, get the whole house done in one go, and then it is easier to stay on top of
Book a babysitter for one afternoon a week as a bare minimum and take some time off. You will burn out if you continue
It sounds to me like the dc are fighting to get your attention, pack all your bags and get up early to do the chores, so when the children are up, you are ready to go.
Don't hold back with the consequences if they are rude, one warning and then follow through. It is easy when we are tired to become more lax because we are exhausted, the ten year old will capitalise on that and the five year old will copy.
Try and get out for the mornings, and leave the afternoons to 'potter' and relax. I find dc are more amenable to pottering if you they have had some fresh air and a change of scene.
I think you need to remember above all that the lockdown has had the most massive impact on all of us, dc included, please cut yourself some slack and be kind when they are angry. Angry is just another way of expressing sadness. It has been awful for everyone, it will pass, but we have to expect this summer to be hard, it was always going to be.
for you. Loosen up on the camping trip with wine and music, try and make the most of it (and book something relaxing when you get back!!)