Interesting question.
First of all the relief of your pain is the real issue and if Paracetamol is not doing the business, then discontinue it.
There are downsides to taking Ibuprofen and are well ...too well....documented although uncommon.
I will not go over them, but will stick to your problem of TIAs.
the relationship between these and Ibuprofen is contentious depending upon the reports you prefer to read. It is a balance between pain relief of Ibuprofen and the unlikelihood of side effects.
In your position I would take Ibuprofen, providing that it relieved my pain and risk the slight chance of further TIAs.
However, that is your choice but take your GP,s advice.
Physiotherapy is of course a reasonable alternative.