Speaking as someone who busted through two pints of Oramorph in as many months (2000mg morphine) yeah you're gonna wanna taper that shit my man. Try get some kratom in if you can too it really does help a lot. Red vein is my go to. Nice and relaxing which is what you need to ease w/d.
May have been worse in my case just because I've done oxy rattles before, you know the kindling effect it's a right cunt. But still kratom (and some tianeptine, as luck would have it) helped loads. Combined with some benzos pretty much obliterated any withdrawals. But I did taper first.
Although for future reference, morphine has a very low intranasal BA. It also has a low oral BA, but it's higher than nasal. Roughly it's 10-20% up the snout and 20-40% in the gob. So you're better off bombing those beads than snorting them.
And if you ever get a 500ml bottle of Oramorph, for the love of Christ, don't just sip straight from the bottle like it's codeine linctus. You'd think this would be obvious, but see I'm a fucking idiot