Anne....I'm back.
These following comments are my own opinion and may not be the majority view. Yes Ibuprofen and Diclofenac are similar drugs in nature and in their action on the body being non steroidal anti inflammatory drugs (Nsaids)
BUT....they do have a slightly different action and bodily response in regard to relief of pain.
Generally speaking:
Ibuprofen is superior in the acute musculo-skeletal disorders..e,g muscle tears, sprains and post traumatic pain.
Diclofenac scores with the degenerative disorders.....cervical spondylosis. lumbo vertebral degenerative problems, osteoarthritis and rheumatoid arthritis in the initial stages.
However if one is on a drug and it is working well, then it is, in my opinion an unsympathetic doctor who will change this regime.
Can you buy Voltarol tablets over the counter? If so, then this is the answer to Tilly's problem.
It may well be that in the case of Tilly, then one dose will keep her pain free throughout the day......"juggling" with the dose is the key here.