Are the following sentences properly constructed?

Are the following sentences properly constructed? Am I right saying that I had escaped a nightmare? Is without hesitation correctly used in my third sentence? Can I omit the conjunction that after the adjective glad and after the noun marijuana to make the sentences shorter? Should I really use the preposition from after the verb phrase have gotten? Thank you in advance for enlightening me.

I found himself lying in bed, sweating profusely. I was glad that I had escaped a nightmare. Without hesitation, I disposed of the marijuana that I had gotten from somewhere. From then on, I trembled at the mere thought of smoking marijuana.