"Manufacturer/supply issues for life saving medication"

I am currently on injections due to two rare forms of blood clots I suffered in 2004  & 2012 .  I was on Warfarin for a while but due to my platelet levels droppings I was put on injections that I took daily.  

Since approx March 2022 I have been on a particular injection.  For the past two repeat prescriptions the pharmacist has not been able to get a supply of these. The first time they were helpful and contacted another pharmacist however, last week when I went to the local pharmacist I was told that not only were there supply issues but also manufacture issue and the injections were not there.

I asked what I was supposed to do but just received a shrug of the shoulders. They asked I contact the pharmacist who helped out before.  I said they should be doing this, and they reluctantly did.  I was upset by their unhelpful attitude. I went along to the pharmacist who did have a supply the next day and got 3 boxes of  injections.

I decided to contact my local GP to inform them of the issues in obtaining the injections and proceeded to inform the receptionist of the issues.  The responses was  that I would need to find out what pharmacy has them. I asked if they were saying that when a GP signs a prescription, they don't  know if the medication is in stock, and they said yes. They confirmed that I would need to find out which pharmacy has them in stock.

I then had to hang up in disbelief that no-one was/is prepared to help me.

I find this very upsetting.  I appreciate the pressure NHS staff are under, but how can a patient be left to find out which pharmacy has these in stock? This is so wrong and I am so worried that when I need the next lot of injections I will have nothing.  If I do not get this medication I am at a very high risk of getting another clot,  which I may not survive.  

Can someone investigate what is happening to the supply of this medication that I and probably many others need.   

I am now also worried that because I have no choice in sharing this I may be treated unfavourably by my GP.