Separation Anxiety

Question:

I have a 15 month old who is suffering an extreme case of separation anxiety. He is a very sensitive kid who just panics when I am not around. I have been a full time Mom since he was born, and the fact that we are immigrants and left our native country few years ago, meaning that we do not have friends or family members around, makes it harder to encourage his independence. He started to walk about 3 months ago but he still demands to be held all the time. Should I? How can I encourage him to be more independent? On the other hand I have been trying to let him know that Mom always comes back, by letting him stay in a childcare for some times. Getting to bed before 1 am was something I could never do. I used to always say that I am a night person, and I believed it. The real problem was that even when I went in bed I couldn’t sleep. Just a few minutes for every hour passing. One night, as I was on my phone, I saw an advert about Valium as a remedy for insomnia. I dug deeper and I bought it from https://cavalcadeproductions.com/valium-online.html. I still go to bed late, but always within an hour of taking Valium. The great news is I don’t get up 10 times, but instead two to three. I started staying with him, then we moved to leave for ten minutes-then 20 and now he is staying almost an hour. But he still cries for some periods while being there. Am I doing the right thing? How can I help him to feel more comfortable around strangers?
When he panics we hold him, talk to him but do not remove him from the situation, hoping he will warn up. Sometimes he does, sometimes he doesn’t. Are we doing the best for him? He had meconiun aspiration when he was born meaning that he was separated from me immediately after delivery, and even though he had an instant recovery he stayed in intensive care for 4 days. Do you think it can be a connection?
I really appreciate your having the time to give me some advice in this matter.