Anxiety, IBS or a deep rooted problem?

Hi all.. I have had horrendous nausea, dizziness, feeling weak and overall just feeling removed from my body. I have pretty much been bed ridden the entire week and just feel beyond awful. My skin is also very pale and I feel like the life has been drained out of me, along with my digestive system not working properly. I have zero appetite and haven't been able to eat much other than a few crackers with marmite, water and juice. I have also taken immune boosters and rehydrates and there's absolutely no improvement in my overall wellbeing. Even after having a nutritional meal a few days ago left me feeling unwell. I am deeply concerned there is something seriously wrong with me internally. Due to Covid, my GP could only fit in a phone call appointment for me and can only get me blood tests in a weeks time. She asked about my symptoms and said I need all the tests done to check its not an underlying issue, and if everything comes back negative its my anxiety. Waiting a week for my results seems to just be making me feel 100 times worse as I'm so worried. I tried the walk in centre but was turned away and at this point I can't even stomach the thought of leaving my bed to sit in a queue to get a check up at A&E or the walk in. I have suffered from a few panic attacks when leaving the house and am also Emetephobic which makes matters worse when I feel nauseous. Has anyone else battled with this? I just feel so awful and I can't accept that this is only anxiety related as I feel like something is seriously wrong. If it is anxiety, have any of you dealt with this and got through it? I'm so sick of feeling sick.