can we summon demons?

Lyceum makes a very good point. You should first work in developing your own strength before working with spirits.. Especially demons. If you are not fully in control if yourself then how can you expect to control spirits that could be potentially dangerous?

Yes you can summon them!

can you help me?

I think part of the problem is that you called on a demon. They bring a wrecking ball to your entire life, and maybe a few lives afterwards, its right up there with curses in that respect. There are other ways to improve your karma and they all are vastly more effective. But it would be far greater for your spirit and your karma if you stay true to what you believe and find the answer there. If something of what you discover here seems to feel more right deep down, then I would say try something from here, but anyway, leave demons out of it. Go to church, explain what you did, and see if they can help remove the negative effects that calling the demon brought in your life.

Do not waver from who you truly are, no matter what,
BrutTorhildr

All of the above pot i subjective belief and does not necessarily represent any truth of the matter, nor is anyone's experience with ANY spiritual being generalisable to another person. Everyone will have different experiences.

Well, some common sense has slipped in. Couldn't have said it better.

Not all demons are bad. Research them. Some are not so nice. Some persuade you to do bad stuff. Some will help. And yes you can summon demons.