Don't worry about the shopping - you don't need any more strain today. Your sole goal is to get through today and to get to see a doctor.
This is the plan.
Ring the doctor at 8.30 and say it is an emergency. Tell receptionist you are suicidal and have been for two weeks and that you can't wait any longer to see a doctor. Really insist. If necessary, get DH to ring up and do the talking.
Hopefully see doctor. If not ring NHS 24 and really insist to whoever you speak to that you are very ill and suicidal. That you need to see someone immediately and that you have already made one attempt. Hopefully, they will make an appointment for you.
Get through morning. Do NOT do any shopping/housework. Just have a cup of tea and try to relax.
Make sandwiches/heat up soup for lunch. No making any of your fancy stuff.
DH home at 1.30. Kids off to PIL.
Now you can decide what to do. If not seen a doctor, I think you should get down to A&E and tell them it is an emergency. That your GP surgery and NHS 24 unable to help.
Keep posting here for support.