Definitely try to get yourself on a DAFNE course. It gives a lot of good fine tuning tips even for people who have been T1 for a lomg time. There's usually a long waiting list for them, though, several months or a year.
We can't give dosing advice but I don't suppose the DAFNE people will mind me quoting from their guidance which says that as a very general rule or starting point that 1 unit of insulin will lower blood glucose by 2 to 3 mmol/L, and 10 grams of carbs will raise it by 2 to 3 mmol/L. They'll generally suggest that 1 unit will do for each 10g of carbs. Works for some people, but others find it's more,say 1.5 units for each 10g - needs a bit of experimenting, they'll suggest trying the same meal a few days running on 1 to 10 and if going too high or low later, tweak it up or down.
I think a lot of us end up on a rollercoaster because we more or less guess insulin, go hypo and then take way too much sugar to correct. DAFNE guidance says take 10g for a hypo and wait ten minutes then repeat if it's not sorted. You'd be surpised by how little glucose is needed to sort a hypo but we often (and this included me before my DAFNE course) just eat till we feel better and that's usually way too much, and then you're correcting to try and bring it back down. Th e reason waiting ten minutes is important is that glucose takes some time to get from your stomach into your blood stream. It's difficult when you're panicking but try to be patient.
I've lost a lot of hypo symptoms but still notice a feeling of lightness,so maybe it's a case of watching out for subtler signs.
If you're hypos are getting really bad, ask about funded CGM. If you can't get it, maybe think about buying a Freestyle Libre. Each sensor lasts 2 weeks and costs about £50. You don't need to use it all the time. Even just a couple of weeks shows a whole lot of stuff you'd never know by just using strips. By far and away the best bit is that because it's reading sugars constantly, it shows a downward arrow if you're dropping quickly. That way,if you're at, say, 5 or 6, with a downward arrow, you can start thinking about sorting out a possible hypo before it happens.