Wa `Alaykum As-Salamu Wa-ramatullah Wa-barakatuh
Yes, you can make up the missed Salah before, regardless what the reason was. Allah is All-Merciful and will forgive anyone who repents and asks for forgiveness and try to make up things.
You do not have to make them up all at once, just pray with each Salah another one until you think you made them all up even if it took you weeks.
The prophet (peace be upon him) said: “if one forgot or slept over a Salah, let him make it up when he remembers it.”
Even the Hadith speaks of forgetting or sleeping, Allah has all mercy to accept people to wants to make up what they owe Him the Almighty. in another Hadith, the prophet (peace be upon him) said: “what you owe God is more honorable to be paid back.”
Almighty Allah knows best.
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