So had a vaginal swab doctor said i looked 'clean' but took swab as been having pain. redness and inflammation, wondering if it's thrush or any infection would there have had to be some form of discharge.?

The main cause of vaginal irritation and redness is yeast infection (thrush). If there are also blisters or open sores, herpes it the main concern. Yeast doesn't cause much discharge; other STDs do, including herpes. If your doctor suspects yeast, it's reasonable to try treating it, such as a vaginal "azole" product (miconazole, clotrimazole, and several others). Otherwise follow doc's advice.