Irritating dry cough for 7weeks after cold, tickly feeling in throat, wheezing,no blood or phlegm, worse when lay down.dr said chest clear, is it bad?

Post viral symptoms : It is common to get post viral symptoms such as you described for up to 12 weeks after s viral infection. If your chest is clear and you are not producing phlegm then it is unlikely there is significant illness. Try some steam inhalation before bedtime or taking an antihistamine. It may help alleviate the symptoms

? reactive airways: disease, can follow a viral URI. Your airways, upper/lower would become twitchy and cause the symptoms that you have, although your lungs would be clear on exam, but with other triggers as exercise, or reflux (on lying down) you can start having dry cough and wheeze. See your GP for control of reflux (? a PPI) and airways spasm (would need a broncho-dilator). You may need to see an allergist