Hi and welcome.
Can you tell us a bit about how you came to be diagnosed? Was it just picked up via a routine blood test or were you visiting the doctor because you had symptoms and if so, which symptoms?
At 30 you are quite young to develop Type 2 diabetes. Do you have any risk factors like being particularly overweight and/or having close relatives with diabetes? The reason I ask is that diabetes is diagnosed via an HbA1c test and anything above 48mmols gets you a diabetes diagnosis BUT the TYPE of diabetes is pretty much guess work on the part of the doctor or nurse. 90% of people with diabetes are Type 2, so it is very "easy" to just assume most patients will be Type 2 particularly if they are adults and perhaps carrying a bit or a lot of excess weight, but that assumption can sometimes be incorrect and the patient can have one of the less common types of diabetes and there are a few, not just Type 1 or Type 2. There are tests for Type 1 but they are quite expensive and not normally done. If your levels are very high and remain high or go higher despite Type 2 meds and dietary changes, then it is important to push for additional testing. I would hope that you will be having a follow up appointment soon anyway, to check your HbA1c again if you were diagnosed in April to assess how you are getting on but you are right to puch for an appointment with the GP if you feel awful.
As mentioned by
@Leadinglights some of the symptoms of very high BG (hypers) can be similar to being too low (hypos) Generally with diabetes, it is the medication which makes you go too low and only certain medications. Diabetes itself makes your levels high. Metformin is not a medication which can make you hypo, so it would be extremely unusual for you to be experiencing hypos with your current treatment. Being able to test your blood glucose (BG) when you feel unwell would be really useful in being able to assess if your diabetes is responsible for these episodes or if your GP needs to look for other causes. You could certainly ask for a testing kit in this situation, but your GP is not obliged to supply home testing, so if they say "no" you may need to consider self funding for home testing. The two meters most frequently recommended for reliability and economy of use are the Spirit Healthcare Tee2 and the Gluco Navii which are both available to buy online. You only get 10 test strips with the meter, so you would be well advised to purchase at least one or more extra pots of 50 test strips for whichever meter you choose (test strips are individual to the make of meter) You will most likely waste a few learning how to test, so the 10 in the kit will be gone in no time. There will also be 10 lancets in the kit. These are "supposed" to be single use, but many of us use them multiple times, but if you are a really scrupulous person and want to follow the advice of single use, you will need an extra box of lancets too. I change my lancet annually on St Swithin's Day as do many others here(we have a St Swithin's day club), so the single use advice is taken with a pinch of salt by many of us,
provided we only use the lancet on ourselves. From time to time most of us end up testing friends and family out of curiosity or as a result of health concerns and then a new, sterile lancet should always be used, but you can go back to using your old one afterwards if you choose, but not the one used on the other person to prevent cross blood contamination.
Anyway, good luck with your phone appointment and perhaps ask for a repeat HbA1c as well as testing kit.... You can only ask!!
If you can provide more info about how your diagnosis came about and the symptoms you experienced then (if any) and are experiencing now with these episodes, then it might give us a bit more insight into your particular situation. Things of relevance would be any unintended or easy weight loss or having gall bladder issues or pain in your upper abdomen going through to your back as these might suggest other types of diabetes than Type 2 and need more investigation.