Hi Aitch, I agree with most things said here . 4.8 is not hypo, it 's normal but that drop was too much overnight and was possibly to do with the alcohol. It happens to many of us from time to time but is potentialy dangerous. Your liver may not help you out
I normally have reasonably good control and go to bed with BS of around 5 and wake at about 4.5, but Boxing day evening, after drinking a bit more than normal I went to bed with BS nearer 6 and woke at 3am with a level of 2.1. That did need treating . However, I didn't need to eat 'loads'. A small amount of very fast acting carbs will raise BS quickly. If you eat everything in sight, you risk rising too high and then need to correct . Some people end up overcorrectin and then yo yo between high and low.
Most fruit (except dates) work too slowly to raise your BS quickly. You would be better to use some dextrose tablets (15gms of carbs worth is normally suggested but may be more or less depending on your metabolism-.) ,one of those small boxes of fruit juice (grape is good) or a small amount (100-150 ml) of coke or lucozade. Wait 15 minutes, then test again. If your BS is not rising,(this will depend on your own experience, but I only need to see evidence that its rising fairly quickly) then you might need to take a little more glucose. After you've treated the hypo, If its some time until your next meal, you might want to eat some slow acting carbs or carbs + a small amount of protein.... thats when you could eat a piece of fruit or half a sandwich or half a cereal bar.(whatever you fancy and works for you)
Its a huge learning processs. You're only just starting on insulin. (and if you're type 1, then you may be still honeymooning and everything is less predictable). Honestly,for most people, things do get easier.