Hi Purplepenguin,
I've had ups and down with my vision. My journey started with me going blind as a result of a HbA1c of 103 back in 2015!
What I would recommend is that you go and have an eye tested, this should be free for you as you are diabetic, if they recommend glasses for reading, great (although do bare in mind that while you're having high's and low's) when it rectifies itself your glasses prescription could well change again.
However they should give you a copy of your prescription, if not ask for it and as them to explain it to you, as you need to know the glasses strength that they may be recommending. Don't buy anything from them just yet, let them know that you're wait for your eyes to settle and return.
But then do as per the previous message, pop in Wilkinson or poundland etc., and find the glasses section and try on a pair of the ones that match your prescription. Hopefully both your eyes will be the same as in +1.50 +1.50, as if they are different, then a cheap pair could make things worse, as cheap pairs assume that both your eyes require the same prescription. IF they are different then only a pair from the opticians will work.
But lets assume the bright side and both eyes are the sames and you try a pair and you ' Can See....'!!!!
I have several pairs I think 5 pairs for £12 from amazon so if they break or I lose them, its no bother, where as if I lost my expensive pair (yes sadly I bought a pair and then realised after I didn't need to as both my eyes are the same), So I have those at work for when I'm tired and need to wear them for the computer...
Still hope all that helped, no sense getting ripped off, but lets the expects at least check you out.
Best of luck.