Finding contentment on a day to day basis

[Grammar]

I find myself feeling, dissatisfied, worried, anxious, always 'chasing my tail' and found myself, yesterday, feeling 'happy' for the first time in ages, as we'd had some good news. It highlighted to me, the difficulty I seem to have in 'enjoying and living in the moment' which I know, people who meditate find easier to manage.
I have a lovely life, I have a happy marriage, three healthy children and a job in the NHS which is at times frustrating but is also rewarding.
I am spoilt.
Why am I struggling when I can clearly see life is harder for others, (that does not diminish my appreciation for my own life, I do really always remind myself that I am lucky).

Is it life, now?, is it my 'spoilt mindset' or is it genuinely harder to function as a parent working almost fill time in this day and age?
I yearn to feel fulfilment and worry that my life is slipping past in a miasma of just feeling 'bogged down'.
What sketch demonstrated that so well, something along the lines of ''What was that?''
That was your life, Mate''. John Cleese I think.

From personal experience, witnessing a pointless and arbitrary death tends to make you take things one step at a time. Or seeing a part of you that should be decently tucked away sticking out. That's always a good time to contemplate the larger things, like insignificance and should milk really be added to ragu bolognese?

Thank you for all you really helpful answers. Objectively, I DO appreciate everything, I just want to FEEL it rather than have to remind myself but maybe that is part of the process?
Tshirts post, where she suddenly 'felt' content resonated with me.
Getting out is very important, I used to have a 40 min walk up hill and down dale with beautiful views, now my job/hours have changed, and it is not possible (certainly in the winter, anyway).
I will try Eckhart Tolle too.
Thank you all for your suggestions.

I am a little late to the conversation, but I think it is important to acknowledge that no matter how hard other people's lives are, working mothers have a lot to juggle and yes, it can be hard to find the time to stop and smell the roses. My gratitude practice really helped me shift my perspective. I have tried many ways of expressing my gratitude, but find that writing a simple list of all the things I am grateful for at the end of the day helps me focus on all the good stuff. I try to involve my children too... we have gratitude post-it hearts all over the fridge. I run an online course to help people create a gratitude practice that fits into their busy lives and have found this process has helped many people appreciate the small stuff which is what life's about. Brené Brown's The Gifts of Imperfection is a great read, as it Tolle. Sending you sunshine smiles. x

Is it possible you're simply a bit bored?

I don't struggle to live in the now, but sometimes the problem is the now is so dull I want to poke my eyes out with pins