A warm welcome to the forum - you can see there are lots of people willing to support you.
You have some great advice already and I'll just join in to say that there are no dark forces waiting to pounce at sunrise or sunset. Some of my loveliest, most peaceful meditations are at sunrise when I have deliberately got up early and driven off to a nearby hill to meditate as the sun is rising and to marvel anew at the 'coming alive' of the world.
Just a note of caution because you say you are suffering from anxiety, depression, panic attacks and unwanted fears.
Meditation gives us a still space which can be very peaceful and very healing. This still space can also allow all this unwanted stuff which we have locked inside to come to the surface. Some meditation sessions can, therefore, not be peaceful, but full of agitation, fears etc. This does not mean they are 'bad' sessions. On the contrary, they are absolutely wonderful.
We are safely sitting in a quiet space with the opportunity just to observe whatever is happening with us. If we can objectively observe what is coming up its hold on us is lessened and we are much freer.
For example: you are sitting quietly, nothing is wrong and then gradually you start to feel fearful. Instead of responding with 'Oh no, I'm frightened, I'll have to stop this, what will happen to me! etc etc' you can just look at what is happening. 'OK fear is arising. How do I know? What is it that is happening in my body that tells me fear is arising'
Some reaction is bound to be happening in the body that is related to the fear - could be coldness and shivering, could be some tightness in some parts, could be tension - it will be your own individual reaction. This objective investigation will take all the heat out of the experience. Of course, it will take time. Maybe to begin with you look objectively for 1% of the time and 99% with fear. Next time the ratio will change and in time the fear will totally collapse as a reaction. It could be fast or gradual - there is no particular time limit. The more objective you are, the faster it diminishes.
This is true also for depression reactions, anxiety reactions and panic reactions. Take out the 'I' and objectively look at the state as it is happening in the body.
Be clear that the meditation is not putting anything in, it is not making anything happen. Rather it is allowing unhelpful states to come to the surface and be recognised and observed.
You may feel this is not what you would want to happen and I could sympathise with that - you probably have a lot to deal with already. If you think, though, that these states happen anyway, when you are least expecting them and often when you are unprepared to react positively. it could be better for them to arise when you are in a safe, quiet space with nothing else to do but observe exactly what is going on.
Be cautious as Giles advises, start with short sessions and only increase the time when you feel really good about how you are handling things. Whenever you remember during the day, take a deep breath in and as you let it out allow the body to relax and let the tension flow away.
let us know how you doing,
peace and joy

Hazel