Please Samuel – what is causing the lightheadedness/dizziness?
Well (M) the hub is causing part of your problem but not all. Try to switch it off when you don’t need it on and it’s a good idea to do your typing with it off too – or in another room. Limit your phone use too.
It would be good to get your sense of smell back so that I can prescribe some oils for you to help with your heart. Try to smell as many oils/perfumes as you can to kickstart your olfactory nerves. The light-headedness isn’t serious (N) – it’s just very debilitating for (M). It’s stops her enjoying life as she should. Switching the hub off when you can will help.