Struggling to get pain relief from gp

Hi all, my husband was diagnosed with squamous cell T4N1M0 stage 3a lung cancer on 4th January, the hospital has prescribed him zomorph morning and night, and oramorph 2.5ml - 5ml every 2 hours as ruired, he started on 2.5ml, this didn’t touch the pain so he’s been taking 5ml approximately 4-5 times a day, he darent take anymore even though he’s in a lot of pain as it’s an absolute nightmare ting to get the gp to issue prescriptions, I’m not joking when I say it’s taking full days and many phone calls to get a prescription sorted out for him, they always say they will ring me back and ner do, they even asked me what dose he needed, so I read the label on the hospital issued bottle, which I’ve put above, they issued one bottle which said 2.5ml every 4-6 hours as required, i rang theback after 2 days of them issuing this bottle as it was Friday at this point and one bottle only lasts either 4 or 5 days and it takes 2 days for gp to issue prescription and also as it was Friday Iasn’t sure it would be even ready by Monday, this is causing so much anxiety to my husband as he’s scared to take his pain relief in case he’s left without any, I’m absolutely ready for going mad, Ihink it’s so disgusting to leave someone to suffer in this way, it’s breaking my heart 

we are at the hospital for radiotherapy scan on Tuesday and his lung cancer nurse has advised me to make sure the consultant gives instructions to the gp to give him these meds, is it normal for gp’to be so reluctant to give these meds, they have had a letter from hospital saying he has been put on these meds but the gp said the hospital didn’t tell them the dosage, so they asked me the dosagewhich is wrong in itself) then proceeded to give him an entirely different dose  he’s in so much pain and the gp don’t seem to care, they wouldn’t allow their family member, or even their pet to suffer like this…