We did visit the Hospital for Tropical Diseases in London and had examinations plus tests done - a follow up appointment is to take place in 2 weeks but all tests so far came out negative (including Chikungunia, Dengue and Zika). I personally think that although some viral infection is possible (or already took place and is now gone) we are looking at inner ear and vestibular issues combined with potential complications from such an infection. I will report with any new developments, but also really appreciate all the posts, thank you!