Why did Allah not give us a choice in this world other than between two paths—Paradise and Hell—given the difficulty of the path to Paradise, and why are there no other options for those who cannot endure the trials of this world?

Allah Almighty is not questioned about what He does, due to the perfection of His wisdom and justice. The minds of His servants are too limited to grasp His decrees. This worldly life is but a few days, so you must be patient, content, and submit to Allah's judgment, and ask Allah for relief and be persistent in supplication. Do not be discontent with Allah's decrees; for whoever is content, contentment will be theirs, and Allah's decree will pass, and whoever is discontent, discontentment will be theirs, and Allah's decree will pass. Allah is far removed from injustice, and all His actions are justice, wisdom, and benefit. You must seek treatment as much as you can, and always supplicate.