Run out- please be nice

I do not abuse pregablin but due to my mental health I often lose track of whether I’ve medication/physically lose it. So I ran out a week ago early in August, GP seemed very uncomfortable but I told her the truth that I had lost it and can’t find it, she very hesitantly agreed to prescribe it a week early. Now it’s November, it’s happened again, except only by a few days this time, but I ran out yesterday so I’ve been cold turkey from it completely, tried to talk to my GP and they have sent it to my pharmacy for Wednesday as they can’t issue it any sooner. I understand why and I understand I need to be more organised but I have been extremely unwell so it’s be hard. Wednesday is only two days away but I feel like I’m dying as I usually take 150 twice daily, I don’t know what to do with myself I have burning in my stomach and heart I can’t breathe. I’m so anxious I feel like I can’t function, I haven’t slept or been able to eat. Any tips on how to cope for the next two days? Are there any otc things that help with anxiety? Supplements etc? I am taking CBD oil but it’s not helping. Any help would be appreciated please be nice