I used optimize on my PC HDD please help

(Full problem) My computer was being very slow, I initially though windows Update and stuff so I left it, but it continued for days,so I opened task manger and monitored in between my work, even for extended periods of time the disk usage(HDD) is always at >90%, no matter the number of tasks or the disk transfer rate. I read online that defragging would solve the issue, so I ran the windows defragger and the usage really went down. I also came across suggestions to use defraggler piriform(I always use ccleaner but I never knew this existed).so I thought I should use that too.

(Please read this) Here I made a big mistake after analysing in piriform defraggler I also ran optimize, I later came across the defraggler doc which goes "optimize is for SSD". My computer uses HDD. What should I do now, it's been stuck at optimizing(83%). And my PC disk usage is at 100% again. I am afraid my HDD will fail. Please tell me what should I do?. Should I cancel the optimize? and just run defrag?.

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double post, please use

https://community.ccleaner.com/topic/60477-i-used-optimize-on-my-pc-hdd/