I just wanted to make a point about therapy/counselling. It doesn't create the feelings out of nowhere. I use therapy/counselling to discuss existing feelings that I can't talk about in real life without either inviting damaging judgments or hurting the feelings of people close to me, and that are having a bad effect on me or my parenting. To get my feelings out in the open so that I can talk about them and find a way forward that works for me and for the people I care about.
If I was fighting to suppress the sense that I resent or fear my child or that I shouldn't have had children at all then my children are very likely to sense it no matter how hard I try to ignore the feeling. I might be directly making my children feel unloved but I might also be uncertain or overcompensating because I feel too guilty to do well-balanced firm discipline so we get a vicious circle of child misbehaving, I feel resentful and despairing, poor discipline, child misbehaves more.
Quite often the surface problem isn't the underlying problem. Does DC remind me of someone earlier in my life, and I'm still judging my DC by my own childhood experience and feelings? Am I feeling such regret because DH isn't stepping up and I can't ask him or he shuts me down?
The way out of the trap is often unexpected. I've had sessions where an unexpected solution came up, not because the therapist suggested it but just because I had put the bad feelings out there and looked at what was behind them so I could see past them to a solution I'd dismissed that could actually work.
Of course there are bad therapists and counsellors in the world but I would expect a good therapist to let me express my worse feelings safely and then once it's out in the open to contrast them with whatever love for my child I've expressed, or look back to see why I had a child at all and re-connect with those feelings, or maybe consider medical reasons why I can't connect with warm feelings; and then I can find a way forward myself.
Discalimer: This kind of regret is not a real-live example for me btw! I've never regretted having DC and DH has been a rock.
One more thing I would say is that if you can't handle mixed feelings then parenting might not be best for you. I'm of the Ozzy Osbourne school of parenting "I love you more than life itself BUT YOU'RE DOING MY HEAD IN!!")