The last and only other time I inhaled whippets was 5 months ago and I did 18 back to back, while remembering to take in a breath of fresh air with each inhale (30%-50% air). I had 2 bulbs left over and did one last month, the second one today, and both times something weird happened. My right ear felt as if I had a little bit of water in it but I just can't quite pop it, like when your ear feels weird but you hold your nose and blow and its fine, that kind of feeling. It throbbed and hurt very slightly and was pretty uncomfortable. Both times it went away after 1 or 2 hours. This time though my chest started to hurt a little bit for 30 min after even though I took in 50% air and held in for 20 seconds. Can anyone tell me what could be wrong? I wanted to use more in the summer and I have read that it's supposed to be a relatively safe drug so I don't know what could be wrong when I have used so little.