To all you extremely knowledgeable and kind folk who responded to my first post.
I took the advice to see GP and turns out that I have a plug in lung hence intermittence of condition . Blackout feeling and dizzyness down to severity of coughing ( have experienced this before but was very ill at time) so, steroids and antibiotics and hopefully things should improve .
Please excuse me for not responding to each of you individually but feeling a tad exhausted.
Many Many thanks to you all